The 4500 and 2500 operate basically in the same manner - automatic. But the 4500 can be roof mounted. As a consequence (IMO), the 4500 seems more solidly built. I had some trouble with my 2500 acquiring and holding signal but in retrospect, probably was my fault for not using the correct splitter.
Anyway - bought the 4500 and love it. Locks on fast and holds signal great.
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US Army Retired - loving it in our Challenger 37TB.
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