Simple! Mount a 1/4 wavelength vertical on a mount that is well fastened to the
bumper/frame with good ground straps or spot welded.

Forget about the whole CB thing of co-phasing.

Ten meter mobile is the easiest HF mobile installation you can ever do.

/s/ DD, W1MCE [50+ years active. 40+ years mobile]

KE5MBX wrote:

I have been advised by some hams that the best way I can hope to do 10-
meters on my jeep is to mount my antenna ON THE WINDSHIELD to get a
good ground plane. I read somewhere since then that the primary
reason for cophasing CB antennas on trucks is NOT to direct the gain
front and back, but to even the ground plane as though the antenna
were in the center of the truck. Could I achieve the same effect with
my Jeep by cophasing antennas on either side of the jeep by the
doors? Even better- could I do this diagonally across from one corner
of my jeep to the other? I heard the further apart the antennas are,
the better, and I'm not really trying to get front/back gain for DXing.