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This is a counterpoise issue and has everything to do with the vehicles matching network which is the ground plane, who ever posted this is an idiot and has no clue what his mfj was showing him.

I had the same issue with my pickup, I had Cowboy 4570 tune my antenna with his mfj and my amps would run nuclear thermal hot so I got to playing with coax lengths and arrived at 21' of rg8u and re tuned my antenna with an swr meter and lowered my reflected wattage and output wattage went up and the amplifier ran normally cool but I had enough common sense to know that when my antenna is mounted to the rear of the bed that it's view of ground plane is compromised.

[QUOTE="mackmobile43, post: 339191, member: 6232"] This is a counterpoise issue and has everything to do with the vehicles matching network which is the ground plane, who ever posted this is an idiot and has no clue what his mfj was showing him. I had the same issue with my pickup, I had Cowboy 4570 tune my antenna with his mfj and my amps would run nuclear thermal hot so I got to playing with coax lengths and arrived at 21' of rg8u and re tuned my antenna with an swr meter and lowered my reflected wattage and output wattage went up and the amplifier ran normally cool but I had enough common sense to know that when my antenna is mounted to the rear of the bed that it's view of ground plane is compromised. [/QUOTE]

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