private land camping questions, cell booster suggestions

As mentioned, legality is totally dependent on the location. But even at that, its not your concern unless the legal decree comes while you are on the land. And if that happened, youd just have to leave- no legal problem for you.

As far as neighbors not liking what another neighbor is doing with his property...as long as it is legal(again that caveat), its just his too bad. If you want to control the surrounding property, you have to buy it. Or buy a politician.

Sounds like a great spot.