How to Choose the Right Coaxial Cable for Amateur Radio
Choosing the correct coaxial cable is critical to maintaining signal strength, minimizing loss,
and ensuring reliable performance in any amateur radio installation. The right coax depends on frequency range,
cable length, power level, installation environment, and mechanical flexibility.
This guide explains how to select the proper coaxial cable for HF, VHF, and UHF operation, compares common coax types,
and highlights practical considerations that affect real-world performance.
Key Factors When Selecting Coaxial Cable
- Frequency: Higher frequencies experience greater signal loss, requiring lower-loss coax types
- Cable Length: Longer runs increase attenuation and impact overall system efficiency
- Power Handling: Coax must safely handle the transmitter’s output power
- Flexibility: Routing requirements may favor smaller or more flexible cables
- Environment: Outdoor installations require UV-resistant jackets and moisture protection
Common Coaxial Cable Options
Amateur radio installations commonly use several families of coaxial cable, each suited to different applications:
- RG-Series Coax: Traditional cables such as RG-8, RG-213, and RG-8X used for general HF and VHF operation
- LMR Low-Loss Coax: Modern, low-loss cables ideal for VHF, UHF, and longer feedline runs
- Hardline & Heliax: Very low-loss solutions for fixed installations and high-performance systems
Matching Coax to Your Station
A short HF run may perform well with standard RG-type coax, while longer runs or higher frequencies benefit from
low-loss alternatives. Portable and mobile installations often prioritize flexibility, while permanent stations
focus on durability and attenuation.
Selecting the correct coax ensures more transmitted power reaches the antenna and more received signal reaches the receiver.
Related Coax & Feedline Guides
→ Coaxial Cable Types & Characteristics
→ Feedline Loss, Attenuation & Frequency Effects
→ Installing & Weatherproofing Coaxial Cable
This guide is part of the Elmer Reference Library and is intended to help amateur radio operators make
informed decisions when selecting coaxial cable for reliable, efficient station performance.
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