Why is coaxial cable the most common feed line for amateur radio antenna systems?

Coaxial cable is the most common feed line for amateur radio antenna systems primarily because it is easy to use and requires few special installation considerations. This makes it highly accessible for both novice and experienced operators looking to set up and maintain their antenna systems. Coaxial cable typically offers a straightforward installation process, often enabling users to connect their transmitters and antennas without extensive knowledge of more complicated systems that might require specialized fittings or configurations.

Moreover, coaxial cable has a relatively robust construction, which allows it to withstand environmental challenges, such as exposure to moisture and rough handling. This practicality and ease of installation contribute significantly to its popularity among amateur radio operators who may not have advanced technical training.

While other feed lines might have specific advantages, such as lower loss or higher power handling capabilities, the combination of convenience, durability, and straightforward usage makes coaxial cable the preferred choice in most amateur radio setups.