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Here's another attempt to design, build, and use an indoor antenna where outside antennas are not permitted. M6STL made this 20 meter hf antenna from 5 meters/16.4 feet of RG-8X coaxial cable. It isn't clear if the antenna is receive only. Apparently, the antenna is usable in his location. If you're in an experimental mood, make an indoor hf antenna and see what results you get. A compromise antenna is better than no antenna.
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Thanks for joining us today.
Aloha es 73 de Russ (KH6JRM).