He's talking about adding a second antenna at the rear of the RV that wouldn't have a coax hooked to it, but it would be grounded to the frame of the RV and act like a reflector element on a Beam antenna... it would make your front antenna sorta act like a mobile-beam forcing more signal forward instead of in a omni-circular pattern...
Not too practical set-up for everyday driving, but good for competitions where 2 guys line up, then see who's got the loudest radio..."shoot-out's"
There's a little more to it also than just adding a second antenna...the second antenna also has to be at the right spacing from the front antenna, and then both antenna's will need to be tuned together.
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