If it’s in the town/city then the local authority will require a planning submission. A ground survey will be required to ensure it doesn’t impact on any services…and some other details.
Highway / route… It’ll be a road authority school as BEAR that you’ll need to liaise with to ensure they just don’t remove it as a non-authorised sign.
Standard poles in town…. generally want the newer collapsing/shear type next to a high speed route.
In a field…see owner, less problematic that a .gov
Certainly from what Ive seen whilst traveling I would suggest making the sign moveable so either on a trailer or in some way not a permanent fixture as it has less implications so long as the land owner is happy otherwise like Dave mentions planning, survey, permissions etc.
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