Or in the case of [MM0OPX] trying to find fly fishing reels that are suitable for his Adjustiwave multi-band VHF-HF ham radio ... linear loaded (folded), vertical antenna.

If you read old antenna books, you’ll probably see the idea of phased vertical antennas ... While you don’t often see phased arrays at HF, they are more common at higher frequencies.

The Information Stations Specialists HPR.0990 is a resonant center and top hat loaded vertical monopole antenna with an integral 50 Ohm transmission line matching unit and optional quick-deployment ...