My bet is your local RC club / HAM radios / Model Airplanes/Boats crowd is the whitest thing in your area. Also they might not even be clubs, just groups of white fathers looking to relax with a hobby.
Can confirm, none of those in my area have a non-White that I've observed.
Ham radio requires a test, some blacks can get by the Technician level test, but General level and Extra level are harder. Tests are a good way to filter. It's a very old crowd but they are generally very based and pretty knowledgeable. It's not a bad skill to have either.
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