Dave Holford article ...

^ I have personal experience, some 40 years ago, with an
^ HF antenna which consisted of the top half of the tail
^ (about a 15 to 20 foot square metal surface) which was
^ tuned by a remote ATU (Collins CU-351 ISTR) and performed
^ at least as well as a fixed wire over the range of 2.5 to
^ 30 MHz.

If I could put an antenna like that 20,000 feet over my house I would be very
happy indeed!

Frank