I can certainly understand your frustration. As we do patrol the airline trail, I would suggest calling your local PD first. Usually the only time we would get involved with a trespassing issue is if someone was hunting/fishing on your property w/o your permission or hunter harassment. We love those calls. If this now becomes repetitive with the same people who now know you are trying to hunt, give us a call and we'll send an officer out. I always try to tell people to be careful approaching and addressing your frustration, you never know what may happen. We as sportsmen have to preserve what little we have in this state. If you can get a plate number from their vehicle or description of the person(s) it would be helpful. They won't like law enforcement showing up at their house to address the issue. It sounds like you have enough signage, just arrogant people. Hopefully they got the message to keep out. Good luck.