If you're having trouble viewing this video, please insert this title URL into your browser search box: https://www.youtube.com/watch?v=OJYCfPLoZ0. RF chokes are used to prevent unwanted RF from entering your ham shack via the feedline. In this video, N7JFP does an excellent job of explaining how to design and build a RF choke for VHF and UHF applications. If you want a RF choke for HF purposes, just take some of the coax feed line near the antenna elements and wind about 5-8 turns into a 4 to 5 inch/10.16 cm to 12.70 cm diameter coil. Secure the coil with 3 to 4 plastic ties and attach it to the mast or supporting structure.
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Aloha es 73 de Russ (KH6JRM).