I have also been told that a good grounded 4.5' Francis mounted on the back of the tractor at a slight angle will force the trailer to be used as a ground plane. My local CB shop quit selling 5' Francis claiming they produce bad SWR readings. I tried this for myself and bought a 4.5 and tried both the 5' and the 4.5', same bracket, same angle, the 4.5' produced flat SWR's.
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