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I have both the AM-25 and the AMT-3000 and both work well. You will be happy with the AMT-3000, but with either of these units, don’t expect great range unless you build a legal coil loaded antenna with a good ground. Check out the other posts here for grounding information. The AMT-3000 has an advantage here because they post the antenna plans on their website. I don’t know if the SSTRAN antenna works with the Ramsey or not since it was specifically designed for the SSTRAN unit.
There are different part15 rules that can be applied for campus AM operations, but they are NOT based on power. They are based on measured field strength at the borders of the campus. Check out the part 15 rules. Let me know if you can’t find it and I can dig out the links and post a followup.
Unfortunately, FCC acceptable measurement of field strength is beyond the capabilities of most people and groups, so setting up a > 100 mW legal station on a campus can involve $$$ for someone qualified to come in and perform the measurements. I am not saying don’t do it, I am just giving you some idea of what is involved. You can always use the 100 mW. input (NOT output) and 3 meter antenna rule and be legal on or off campus.
I taught in an EET program and for one of our communication labs we would set up a AM-25, attach an antenna and CD player, check it with a spectrum analyser, and the students would tune in on their way home. Never got much range beyond the parking lots, but it was still fun. Just so you won’t be disappointed and know what to expect, the indoor range was lousy…could not hear it 20 feet down the hall. A 3 meter antenna out the window did get out much better.