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2025 Top 5 Low-Loss Multiband GNSS External Antenna Extension Cables in Canada — Engineer-Reviewed Picks for L1/L2/L5 Precision (Tallysman, NovAtel, Laird, Emlid, Proxicast)

Published on Monday, August 25, 2025

Low-loss extension cables optimized for multiband GNSS signals (L1, L2, L5 and other global navigation systems) are essential accessories for high-precision receivers and timing applications. These cables are designed to minimize signal attenuation and preserve carrier-to-noise ratio (C/N0) across long runs and challenging installations. In Canada, buyers prioritize low insertion loss, durable weatherproof connectors, and proven performance in cold and coastal environments. Professionals in surveying, terrestrial and marine navigation, precision timing, telecommunications, and autonomous systems choose cables that balance electrical performance (shielding, dielectric stability, attenuation vs. frequency) with ruggedized build quality and reliable connector terminations. Cost-effectiveness, local availability, and compatibility with common antenna and receiver connector types (SMA, TNC, N-type through adapters) also strongly influence purchasing decisions in Canadian markets.

Quick Menu

1. Best High-Performance Low-Loss

2. Best OEM NovAtel Compatibility

3. Best Mid-Length LMR-240

4. Best Short GNSS Patch Lead

5. Best Long SMA Extension

1
BEST HIGH-PERFORMANCE LOW-LOSS

Tallysman TNC Male to SMA Male Low-Loss Antenna Cable (10 m)

Tallysman
🏠 Local Product

Tallysman's 10 m TNC male to SMA male low-loss antenna cable is positioned as a precision-grade option for multiband GNSS systems, offering tight phase stability and low group delay that benefits high-accuracy surveying and timing applications. Compared with the other cables in this list it emphasizes manufacturing consistency and multiband performance at a competitive price point, making it a best-in-class choice when measurement fidelity matters more than the absolute lowest per-meter cost.

4.6
★★★★☆

  • Ultra-low loss

  • Long 10m reach

  • Ultra-low loss

  • Long 10m reach

Review Summary

92%

"Users praise its very low loss and solid TNC-to-SMA connectors; it performs reliably in 10 m GNSS setups, though a few noted the cable is stiffer than cheaper alternatives."

  • TNC-to-SMA tango

  • 10 m LMR-240 low-loss coax designed to minimize GNSS signal attenuation

  • TNC-to-SMA tango

  • 10 m LMR-240 low-loss coax designed to minimize GNSS signal attenuation

Time-Saving Convenience

Skill Development & Mastery

Tallysman's 10 m TNC male to SMA male low-loss antenna cable is positioned as a precision-grade option for multiband GNSS systems, offering tight phase stability and low group delay that benefits high-accuracy surveying and timing applications. Compared with the other cables in this list it emphasizes manufacturing consistency and multiband performance at a competitive price point, making it a best-in-class choice when measurement fidelity matters more than the absolute lowest per-meter cost.

  • Ultra-low loss

  • Long 10m reach

  • TNC-to-SMA tango

  • 10 m LMR-240 low-loss coax designed to minimize GNSS signal attenuation

  • TNC male to SMA male connectors for straightforward external antenna linking

  • Ultra-low loss

  • Long 10m reach

  • TNC-to-SMA tango

  • 10 m LMR-240 low-loss coax designed to minimize GNSS signal attenuation

  • TNC male to SMA male connectors for straightforward external antenna linking

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$120-200 CAD

2
BEST OEM NOVATEL COMPATIBILITY

NovAtel LMR-240 Antenna Cable, TNC Male to SMA Male, 10 m

NovAtel
🏠 Local Product

NovAtel's 10 m LMR-240 TNC-to-SMA cable is a market-leader offering backed by OEM-level specifications, documentation and support, which translates to predictable performance in enterprise GNSS deployments. It typically commands a premium versus general-purpose brands on this list, but that higher price reflects stricter quality control, connector reliability and guaranteed compatibility with professional receiver ecosystems.

4.4
★★★★☆

  • Stable signal

  • Rugged 10m

  • Stable signal

  • Rugged 10m

Review Summary

88%

"Reviewers report dependable LMR-240 performance with low attenuation and good connector fit for 10 m installations; some observed minor manufacturing variability but overall satisfactory long-term use."

  • NovAtel wink

  • 10 m LMR-240 construction optimized for NovAtel antenna and receiver systems

  • NovAtel wink

  • 10 m LMR-240 construction optimized for NovAtel antenna and receiver systems

Time-Saving Convenience

Skill Development & Mastery

NovAtel's 10 m LMR-240 TNC-to-SMA cable is a market-leader offering backed by OEM-level specifications, documentation and support, which translates to predictable performance in enterprise GNSS deployments. It typically commands a premium versus general-purpose brands on this list, but that higher price reflects stricter quality control, connector reliability and guaranteed compatibility with professional receiver ecosystems.

  • Stable signal

  • Rugged 10m

  • NovAtel wink

  • 10 m LMR-240 construction optimized for NovAtel antenna and receiver systems

  • TNC male to SMA male connectors with 50Ω impedance for multiband GNSS use

  • Stable signal

  • Rugged 10m

  • NovAtel wink

  • 10 m LMR-240 construction optimized for NovAtel antenna and receiver systems

  • TNC male to SMA male connectors with 50Ω impedance for multiband GNSS use

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$140-240 CAD

3
BEST MID-LENGTH LMR-240

Laird CA240-SMAM-SMAF-25

Laird

The Laird CA240-SMAM-SMAF-25 is a value-oriented LMR-240 extension that balances low attenuation and robust shielding with an installer-friendly price, making it attractive for commercial and industrial installations. Relative to NovAtel and Tallysman it offers strong durability and cost-efficiency for longer runs, while sacrificing some of the ultra-tight phase specs prized in precision surveying applications.

4.6
★★★★☆

  • Low-loss CA240

  • SMA M-F

  • Low-loss CA240

  • SMA M-F

Review Summary

91%

"Customers highlight excellent build quality and consistent low-loss performance over the 25 ft length, with robust SMA connectors and a professional finish; very few users reported issues."

  • 25ft stretch

  • LMR-240 cable type delivering low insertion loss across GNSS bands

  • 25ft stretch

  • LMR-240 cable type delivering low insertion loss across GNSS bands

Time-Saving Convenience

Skill Development & Mastery

The Laird CA240-SMAM-SMAF-25 is a value-oriented LMR-240 extension that balances low attenuation and robust shielding with an installer-friendly price, making it attractive for commercial and industrial installations. Relative to NovAtel and Tallysman it offers strong durability and cost-efficiency for longer runs, while sacrificing some of the ultra-tight phase specs prized in precision surveying applications.

  • Low-loss CA240

  • SMA M-F

  • 25ft stretch

  • LMR-240 cable type delivering low insertion loss across GNSS bands

  • SMA male to SMA female configuration at ~25 ft length for mid-range placement

  • Low-loss CA240

  • SMA M-F

  • 25ft stretch

  • LMR-240 cable type delivering low insertion loss across GNSS bands

  • SMA male to SMA female configuration at ~25 ft length for mid-range placement

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$50-90 CAD

4
BEST SHORT GNSS PATCH LEAD

Emlid TNC to SMA cable 2 m

Emlid

Emlid's 2 m TNC to SMA cable targets portable and short-run GNSS setups, delivering minimal loss simply by virtue of its short length and keeping total system cost low for field crews and hobbyists. Compared with the longer and more premium cables here, it is the most cost-effective choice for compact rigs and mobile deployments where lower attenuation from short cabling and affordability are the main priorities.

4.5
★★★★☆

  • Compact 2m

  • Lightweight flex

  • Compact 2m

  • Lightweight flex

Review Summary

90%

"Users find the 2 m TNC-to-SMA cable well constructed and ideal for short GNSS setups, offering low loss and secure connectors; occasional comments mention it's pricier than generic options."

  • Emlid nimble

  • 2 m TNC to SMA cable ideal for short connections between receiver and antenna

  • Emlid nimble

  • 2 m TNC to SMA cable ideal for short connections between receiver and antenna

Time-Saving Convenience

Skill Development & Mastery

Emlid's 2 m TNC to SMA cable targets portable and short-run GNSS setups, delivering minimal loss simply by virtue of its short length and keeping total system cost low for field crews and hobbyists. Compared with the longer and more premium cables here, it is the most cost-effective choice for compact rigs and mobile deployments where lower attenuation from short cabling and affordability are the main priorities.

  • Compact 2m

  • Lightweight flex

  • Emlid nimble

  • 2 m TNC to SMA cable ideal for short connections between receiver and antenna

  • Low-loss coax suitable for L1/L2 (and other multiband) GNSS frequencies

  • Compact 2m

  • Lightweight flex

  • Emlid nimble

  • 2 m TNC to SMA cable ideal for short connections between receiver and antenna

  • Low-loss coax suitable for L1/L2 (and other multiband) GNSS frequencies

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$25-60 CAD

5
BEST LONG SMA EXTENSION

Proxicast Pro-Grade 240 Low-Loss SMA Male to SMA Female Coax Extension Cable (25 ft)

Proxicast

Proxicast's Pro-Grade 240 25 ft SMA male to SMA female extension is a practical, budget-friendly option for installers who need consistent low-loss performance over longer distances without paying OEM premiums. It competes strongly on price-per-meter against brands like NovAtel and Tallysman, offering reliable shielding and acceptable insertion loss for multiband GNSS while conceding some top-tier phase stability to the premium, survey-grade cables.

4.3
★★★★☆

  • Pro-grade 240

  • Long 25ft

  • Pro-grade 240

  • Long 25ft

Review Summary

86%

"Buyers appreciate the Pro-Grade 240 cable's value and generally good low-loss characteristics for the price, though some note slightly higher attenuation than premium brands at longer lengths and occasional connector fit issues."

  • SMA pair party

  • 25 ft Pro-Grade 240 low-loss SMA male to SMA female extension for long GNSS runs

  • SMA pair party

  • 25 ft Pro-Grade 240 low-loss SMA male to SMA female extension for long GNSS runs

Time-Saving Convenience

Skill Development & Mastery

Proxicast's Pro-Grade 240 25 ft SMA male to SMA female extension is a practical, budget-friendly option for installers who need consistent low-loss performance over longer distances without paying OEM premiums. It competes strongly on price-per-meter against brands like NovAtel and Tallysman, offering reliable shielding and acceptable insertion loss for multiband GNSS while conceding some top-tier phase stability to the premium, survey-grade cables.

  • Pro-grade 240

  • Long 25ft

  • SMA pair party

  • 25 ft Pro-Grade 240 low-loss SMA male to SMA female extension for long GNSS runs

  • LMR-240-like performance with low attenuation across multiband GNSS frequencies

  • Pro-grade 240

  • Long 25ft

  • SMA pair party

  • 25 ft Pro-Grade 240 low-loss SMA male to SMA female extension for long GNSS runs

  • LMR-240-like performance with low attenuation across multiband GNSS frequencies

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From 50.87$

Why Low-Loss Multiband Extension Cables Matter — Research and Practical Findings

Multiple technical studies and industry white papers show that reducing coax loss directly improves GNSS performance metrics important to real-world users: higher carrier-to-noise ratio, faster time to first fix (TTFF), more reliable RTK/PPP fixes, and better resistance to multipath and interference on weak signals like L5. Lower loss is especially valuable on long cable runs, cold climates where receiver noise budgets tighten, and installations that use external antennas separated from receivers by several meters. Field tests from GNSS manufacturers and independent research consistently demonstrate measurable benefits when high-quality low-loss cables are used instead of generic thin coax.

Preserving C/N0 increases fix reliability: Studies and manufacturer tests show that every decibel of unnecessary loss can reduce C/N0 and increase ambiguity resolution times for high-precision modes.

Long runs amplify differences: Over lengths typical in surveying, marine, and roof-top timing installs, low-loss cables retain more usable signal power than standard thin coax, leading to better RTK baseline stability.

Multiband signals benefit more: Because L2 and L5 are critical for ionospheric correction and PPP, maintaining signal integrity across bands improves positioning accuracy and robustness.

Environmental robustness matters: Tests under temperature cycling and wet conditions highlight the importance of good connectors and jacket materials to sustain low-loss characteristics over time.

Best-practice testing: Using a VNA or spectrum analyzer during installation to check insertion loss and return loss is recommended by industry guides and helps validate field performance.

In the Canadian context—where long cable runs, harsh winters and coastal environments are common—choosing a low-loss multiband GNSS extension cable pays off in reliability and accuracy. The leading options covered on this page are: Tallysman TNC Male to SMA Male Low-Loss Antenna Cable (10 m), NovAtel LMR-240 Antenna Cable, TNC Male to SMA Male, 10 m, Laird CA240-SMAM-SMAF-25, Emlid TNC to SMA cable 2 m, and Proxicast Pro-Grade 240 Low-Loss SMA Male to SMA Female Coax Extension Cable (25 ft). For most Canadian surveyors and timing installers looking for the best balance of proven field performance, low attenuation over medium runs, and broad compatibility, the NovAtel LMR-240 Antenna Cable, TNC Male to SMA Male, 10 m is the recommended all-round choice on this list. We hope you found what you were looking for; if you want to refine or expand your search by length, connector type, or environmental rating, use the search to narrow options or compare specifications in more detail.

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