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The longest one you can get, or make fit. 102" whip would be the best, just keep as much of the antenna away from the body of the vehicle as possible. When it comes to CB, the closer you can get to the 102" whip, the better it's going to work for you.
The antenna is your problem not much gain. Height is everything tx and rx. Although it would not compare to a conventional cb size negates performance. Seeing is believing in this case hearing get adapter to connect to standard coax of antenna.
(PL259) to BNC Coax Adapter
Radio Shack sells them. And dont ask or buy any radios there. They are hardly the radioshack of choice anymore.
If you put 4 watts into a four-foot antenna, you will get the same power out of that antenna as if you were putting 2 watts into a 102-inch whip.
If you put 4 watts into a 3-foot antenna you will get the same power out as if you were putting about 1.5 watts into a 102-inch whip.
If you put 4 watts into a 7.5 inch antenna on a hand held CB, it would put out as much power as a third of a watt into a 102-whip.
If you put 4 watts into a 102-inch whip antenna, it is the same output as if you put 11 watts into a 3-foot whip.
If you put 4 watts into a 102-inch whip antenna,, it is the same as if you put 14 watts into a 28-inch antenna.
If you put 4 watts into a 102-inch whip antenna, it is the same as if you put 54 watts into a 7.5 antenna.
make sure NO ONE clipped your modulation limiter!!!! the Magnums are way over modulated of a radio. any mods will cause trouble. you are probably getting a feedback making it sound like a roger beep.. also it will depend on your SWR's make sure they are good on the band that you are talking on. ie.. no antenna on the market can work 10-12meters except maybe the 108"whips $17.99 and the predator 10k.... so be sure to check the swr's on ever channel that you would operate on. like ch 19 and 28.xxx and be sure first. high swr's will cause feedback on any radio.
RF feedback into the radio most likely from bad SWR or poor ground counterpoise at the antenna. Change out antenna to something more capable of use with this radio. Maybe a 102 stainless steel whip or Wilson 1000 or K40 type.
-should be tuned, have good coax with no pinches, whip is centered over highest flat metal surface, no metal beside adjacent to whip, power is wired to battery direct, not to ignition or cigg lighter. whip is wiped clean of corrosion, whip is up, longer is better.
Praire City car-to-car: 15-20 km's
Praire Rural car-to-car: four-thirds over the horizon. Probably 60 km's.
Alot further over water.
Less within trees and mountains/valleys.
Google "Ham radio" & "ducting" "inversion" "skip" "sun-spots"
these refer to a condition where a radio signal getting stuck between the upper and lower atmospheres and travel intact for 1000's of km's (canada to mexico for example)
the shielded coax rgu-45 series is probably the best one for this application also if you run the radio to a different fuse or u can also get a surpression filter that goes on the coax line I own a WL9000 KW. i had the same problem untill i got the filter installed at a loves truck stop in texas and no more problems since ok?
drive safe and best regards mike (warner transp.)
OUCH! Cb antennas are cut to a specific frequency. FM antennas are also cut to a specific frequency. If you ground the antenna to a frame, you short out the antenna. BAD THING. If it is a 102" whip, you would have to cut off about 2/3's of the whip to work. If there is a cylinder at the base of the antenna You would only need about 7' of the whip sticking out for it to work right. Inside the cylinder there is a coil that would make up for the missing length of a 102" whip. I would suggest finding an old CB with FM built in like one of the old SEARS CB/FM receivers.
They had the electronics built in to compensate for the varience in the old sets.