Several years back, I ran an 800 MHz ¼-wave antenna connected to an RS PRO-95 (a GRE-built radio) when mobile. That thing pulled in a grievous amount of intermod, not even being close to cell/Nextel sites. Switching to the stock duck eliminated the intermod problem, and using the mobile antenna didn't really yield any benefit in terms of improved received signals because of all the intermod it pulled in with them.
I know its a 600, and you probably have it nicely installed in your car, but that mobile antenna is probably too much for it. Probably the best you can do is use the built-in attenuator, but as mentioned above that may not be enough. When I take the 500 in the car with me, I just use the RS/GRE 800 rubber duck that I use on it everywhere else. It pulls in plenty of signal (and intermod) without the help of a mobile antenna, and I use the attenuator as needed. Its not bad out in the rural areas but in the city, forget it. Might as well just leave it on all the time.
Post-rebanding, some of the intermod situation may improve, but with a scanner with a wide-open front end, its always going to be a problem.
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"...interoperability will always be a pain because the people who are supposed to be working together want nothing to do with each other until something really bad happens." -shell6
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