There is an awful lot of license free equipment on 915MHz, a lot of which is run by people who know nothing about radio. Good luck getting all of it off the air.
No joke. Just think of all the LoRa stuff out there.
Even my smoke alarms use 915MHz to link together. The documentation doesn't say what frequency is used. You have to look up the FCC ID online to find that out. They are constantly transmitting to each other and start making a racket if anything interferes with them.
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