My suburban PA neighbors had Trump signs stolen last night. Mine is still surviving.
Dab some honey on your Trump sign; it will be crawling with ants.
Spray your signs with tanglefoot. Not only will it ruin the thief’s day it will ruin their clothes and car upholstery steering wheel and carpet if after they touch it. It is spray on fly paper. Very hard to remove from skin never mind anything else it touches.