Getting loaded (antenna-wise, anyway)

A couple of years ago, I homebrewed a “Cobra” antenna. It’s a doublet antenna, meaning that it consists of two elements connected to a center insulator, where it connects to a feedline. The unique thing about the Cobra antenna is that each element consists of three parallel conductors connected in series. My antenna uses a lightweight, three-conductor rotor cable that used to be available from Radio Shack. The feedline is 450 Ω ladder line that connects to an antenna tuner to give me multi-band operation. Connecting the conductors in this…

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