I have been using a similar system in my mobile for about three years. I
use a screwdriver whip antenna for 160M thru 15M. Because the whip is about
14 feet when it is all the way down It will not resonate on 10M. I have
mounted a steel whip to the bottom of the screwdriver for that band. I pull
the top of the whip away from the screwdriver with a fishline to keep the
two antennas from tangling while in motion. It seems to work fine and I
have found no interaction and the screwdriver will give a good match at all
bands from 160 to 15M.
73 Don KH6DX/M
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