Ed, K7AAT wrote:
"....but as I stated, most of my parking situations preclude putting out
anything beyond a short perimeter around my rig.... necessitating a
vertical, (with very short radials at best)."

Phil faced the same challenge. Item (1) of his summary says:
"Carry a complete set of mobile whips for lunch stops, or other
occasions where you do not have the time or room for anything better."

First on the list in Table 3 is:
"Hustler 75-meter mobile whip mounted vertically on the rear corner of
trailer...... S7"

Item (2) says:
"If at all possible, use a 1/4-wave counterpoise clipped tothe trailer
when using a mobile whip."

Second on the list in Table 3 is;
"Same as above, with 60-foot counterpoise wire connected to
trailer...................................S9"

So the counter poise adds about 12 dB to the signal.

A 15-ft high (at the center) 120-ft long dipole is S9+20 dB in Table 3,
but surprisingly the loop including the trailer is its equal. The loop
is only 30 feet long, or almost the length of the trailer.

Best regards, Richard Harrison, KB5WZi

Phil faced the same challenge. Item (1) of his summary says:
"Carry a complete set of mobile whips for lunch stops, or other
occasions where you do not have the time or room for anything better."

First on the list in Table 3 is:
"Hustler 75-meter mobile whip mounted vertically on the rear corner of
trailer...... S7"

That's all I have right now. 75M resonator, and the antenna is
mounted on top my rear ladder.... which is well bonded to the chassis
frame down below. It works rather well, I believe, but both I and my
wife don't want me climbing the ladder for installation/removal, or
tuning purposes.




Item (2) says:
"If at all possible, use a 1/4-wave counterpoise clipped tothe trailer
when using a mobile whip."


Will try that...


Second on the list in Table 3 is;
"Same as above, with 60-foot counterpoise wire connected to
trailer...................................S9"


I suppose a 60' coil of small wire wouldn't be hard to pack.... will
try that too, when space allows. BUT, since I'm mostly on 75/80,
whats the difference between the first two, anyway?


So the counter poise adds about 12 dB to the signal.

A 15-ft high (at the center) 120-ft long dipole is S9+20 dB in Table 3,
but surprisingly the loop including the trailer is its equal. The loop
is only 30 feet long, or almost the length of the trailer.


Well, certainly don't have space for that dipole, and the RV is
fibreglass so no easy way to include it in a loop.


Also, though I didn't previously mention, don't want the antenna to
be that noticable. A vertical has less visual impact, in my opinion, in
that area.

Thanks, Richard.


Ed K7AAT