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Dummy or not, it interrupts the signal, truckers do it because the trailer blocks the signal from making it to the other side, but practical applications are best with one.
I have two and have had two for years with no problem. Both are working and not a "Dummy" antenna. I am now starting to have problems with the connections and I will most likely replace them with one.
I tow a fifth wheel and won't be able to mount it in the rear like I wanted so Mine are presently on the outside of each mirror.
To run dual whips and functional, you need a real good CB peaked and tuned then the antennas tuned in for optimum performance. I have a Uniden LTD made in the Phillipines, sought after due to being the ones that put out the most watts, a trucker friend had it done, then gave it to me. I need someone to get on my roof with a wrench to remove the broken base from the mount, so I can replace it, but have been considering a different arrangement so I can remove it when height restrictions exist.
Most antennae are verrry close in "working right"...The TYPE makes for the signal strength and range. Some people think bigger is better - NOT true.. A good small one will output a cheap BIG one. The place mounted will affect the signal > rear mount has a stronger front signal + front mounts have a stronger rear signal + twin mid mounts tend to have an "X" pattern signal. A single center-of-body mount will give the best overall signal. There are base / center - top loaded antennas. Another thing to consider is WHAT wave-length is the antenna set for ? OR just get 1 that you like the looks of. Not trying to confuse the issue, but there is a bit of "science" involved- specially when it comes to base station antenna.
That's what I'm gettin at, dual whips on a cheap store bought CB is pissin into the wind, does not work as good as a single antenna, for occasional use, use a magnet mount and put it up top and center.