I was wondering how close do you have to be to OHIO MARCS tower to have it overload your scanner? Also if you are to close to the tower will it cause interference on your other frequencis that are further away from you?
Even towers 3-5 air miles away could overload your scanner -- depending upon the scanner, the antenna, your location [high elevation].
The newer generation GRE scanners are more likely to be desensed by strong local signals on VHF / 800 Mhz than Uniden scanners, at least from my experience.
VHF can really be ripped up easy on GRE scanners, a little less problematic on 800 Mhz. There is a local county trunked system tower and a MARCS tower, both about 3 air miles away from me, and they dense 800 mhz a little bit. But I'm using an outside antenna, an active multicoupler, and a GRE scanner.
I know that using my PSR-500 and driving into town (the largest cities in the county, but by no means large cities), 800 mhz overlloads pretty easily for me. I generally have to put the attenuator on.
Mike