Lighting is regulated as to color and intensity.. But I do not think it would offend.
Another option is a CMS (Changable Message Sign) this is purely reflective not a light, In your case it would be simple Three Sided blocks (2 sided woudl work but 3 sided are easier) Turned one way they spell out 146.52, Turned out the other way all blank or just Ham Radio (2 lines) or even all 3 positions.. Think Concentration TV show game board.
Another version of this I have seen is a "Shutter board" basically a flat black panel with slots.. (It can also say Ham Radio on it) but there is a cardboard page behind it (Use poaster board) and when the thing is "activeated" this board slides in between the flat black backer and a class or plexiglass cover with an alternate message.. You see this kind of thing on Billboards all the time.
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