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They'll start to care pretty quickly when they get a visit from a 3-letter agency (just one example [0]). - [0] https://www.jdsupra.com/legalnews/fcc-enforceme

• CamperBob2 5y ago
  Realistically, that's not going to happen unless a harmonic lands within the ATC band or a GPS subband. The trouble is, that's entirely possible. This sort of thing needs a good enclosure, or at least some board-level shielding.
• lstepnio 5y ago
  99.999999999% not going to happen. On the remote chance does, expect a simple educational talk.