My shop is connected to my home alarm and all the entry points are covered and a motion detector are installed. It is also a panic zone, so no time to even let someone get in. I am down 4 feet because I have air lines, cable, 230V circuit but you could do a simple conduit buried down a foot or so with phone line in it for the alarm. Alarm systems are very cheap as well as cameras that record onto your PC.......
All our government does is distract us while they steal from us, misspend our tax $ and ruin our country