I have no trees, streelamps, telephone poles, or anything higher than a
7 foot trailer. That was why I was considering a vertical. For
practical purposes anything higher than 40 feet is forbidden and 25
foot is as high as I practically dare do.

....[snip]....

Be patriotic: erect a 33-foot metal-pipe flagpole WITH pulley and rope.

Set the bottom of the pole on a strong/thick soda-pop or beer bottle
which is restrained to/in the ground somehow
(I've buried a concrete block -- with its holes
vertical -- until its top is even with the ground
surface, put the bottle in one of the holes, and
filled the extra space with dirt),
mount it firmly to (but insulated from) the top of your trailer, and
feed it with coax
(connect the coax shield to a ground rod driven through
the other hole in the concrete block, the coax center
wire to the base of the tower -- I mean flagpole --
and put a 50-100 Kohn resistor across the connection).

It'll work quite well by itself on 40 and 15 meters, and if you use an
"antenna tuner", you should get acceptable results on 20 and 10 meters
(and higher). With an extra inductor at the base, it should give
passable results on 80 and maybe even some results on 160.

Let your neighbors see you driving in several additional ground rods and
laying lots of radials (although I'm usually lazy and just use the wires
to the ground rods) "to extend lightning protection".

Don't forget to fly a flag occasionally! That's part of the disguise.
--
--Myron A. Calhoun.
Five boxes preserve our freedoms: soap, ballot, witness, jury, and cartridge
PhD EE (retired). "Barbershop" tenor. CDL(PTXS). W0PBV. (785) 539-4448
NRA Life Member and Certified Instructor (Home Firearm Safety, Rifle, Pistol)