What is Reddit's opinion of RF Explorer Digital Handheld Spectrum Analyzer Model WSUB1G 240-960 MHz?

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You can use a wireless spectrum analyzer from Fluke to see what frequency your fob is on (test it outside the area) and then check the area to see what else is running on that frequency. Sounds like someone is running a jammer or has a very powerful broadcast on that frequency that you're just too close to (which would be illegal). If you can isolate the source or the frequency, the FCC can come in and take care of locating and shutting it down.

There are often analyzers on the state surplus site and ebay for cheap. I know Tmo techs used to carry them so if you see one of those vans around fixing a tower, you could ask them.

I'm actually pretty interested in this as well.

If I'm not wrong, your fob should be running around 315mhz

This should do the trick https://www.amazon.com/Explorer-Handheld-Spectrum-Analyzer-WSUB1G/dp/B01EWSJP7Y

You can buy an RF explorer from amazon for like $130. I got the basic silver model, but they have one that can scan the 2.4ghz range, as well. We run all Sennheiser, so I take scans with the RF explorer, which is plugged into my laptop via USB. I use Vantage to take the scans, convert it to WWB, and then coordinate. There are other programs for both PC and MAC for cheaper that takes in scans and converts them to WWB. Shure has an hour long tutorial on youtube that will teach you almost everything you need to know to get started.

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The RF explorer comes with an antenna that screws on to the device itself. You can buy a SMA to BNC so that you can hook up your explorer to your wireless distro. I would check out Drew Brashler on Youtube about wireless coordination. He has a video that goes through RF coordination from beginning to end, and has some really good tips.

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It you run all Shure wireless that can connect via cat cables, you can really do some cool things with WWB. It would let you monitor RF in real time, push new freqs without having to go to the receivers, and etc.

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Best of luck!