As per the NH Dept.of Justice :
Where can political signs be posted? RSA 664:17 regulates the placement of political advertising. Public property – no political advertising shall be placed or affixed to any public property including highway rights-of-way Private property – requires the owner's consent Utility poles/highway signs – no political advertising is allowed State-owned rights-of-way – political advertising is allowed as long as the advertising does not obstruct the safe flow of traffic and the advertising is placed with the consent of the owner of the land over which the right-of-way passes.
What is the penalty for removing a political sign? In addition to the available criminal penalties for violating RSA chapter 664, the Legislature has established a civil penalty of up to $1,000 per violation for "removing, defacing, or destroying political advertising on private property." RSA 664:21, VI (a)-(b).
Town of Moultonboro: In 2008, the BoS passed a motion that prohibits political candidates campaigning on Town property, except that allowed by State Statutes at the polling place on Election Day.