Why is coaxial cable the most common feed line for amateur radio antenna systems?
It is easy to use and requires few special installation considerations✓Bonne réponse
It has less loss than any other type of feed line
It can handle more power than any other type of feed line
It is less expensive than any other type of feed line
Explication
Coax is popular because it is self-shielding, so it can be run alongside metal, through walls, in bundles and around corners without upsetting its impedance or radiating. Open-wire line has lower loss and hardline handles more power, so the appeal of coax is convenience, not superior performance.