[W9WLS]

Google "Towel bar antennas".
These were / are communally used on planes that had / have HF capability's .
I've wondered about using one on a motor home but can find little "REAL" information on them except they are rather pricey if you think about buying one.
Maybe someone "out West" near one of the "Bone Yard's" / surplus dealers would have a shot at getting one to try .
The best info I have is that they are , end fed, aprox.14 feet long, stand off the aircraft about 10 inches, and must be used with a tuner.
If anyone find's more information please pass it along.

40 years or so ago, I built what amounted to a stub tuned 20 meter "SQUALO" for a friend with a "CAB-OVER" camper , stood off the "luggage rack" about a foot on Plexiglas pieces , also used a 1:1 balun to to make the transition from coax, the thing worked well for him and he used it till he became a silent key about 15 years ago.
Also built one for the same camper for 40 meters which worked well, plans are long gone but I do remember I used 1/2 inch Alu conduit for both.