Our Rod and Gun Club has been broken into 3 times in the last 2 years.  So far they have not done any vandalism, just stolen things.  Last 2 break ins have the same MO.  Cut the padlocks or crawl through a window, steal gas , gas cans, propane heater, kerosene heaters, motor oil etc.  Our club is out in the country, no Wi-Fi or even good cell service, but lots of deer and critters. Our neighbors are 1/2 mile away.  We are upgrading our dusk to dawn lighting, adding motion lighting, installing dead bolts, bars to windows and would like to install a siren or horn that has motion, door and window activation.   We think motion lights and a siren or horn of 200 db. would deter entry.   Ring and ADT are out of the question, no Wi-Fi or cell.  Have been researching DIY burglar alarms.  Anybody with some firsthand experience???