Waterborne
Member
Depending on the situation and area, Things like trip wire alarm devices, LPOPs and security patrols (depending on the size of your group) can all help with perimeter security. To limit the usage of vehicles into your area you could use 1/4" vinyl coated cable across roads and driveways that is secured with the screw on wire clamps, you can use JB weld on the threads to prevent them from being unsecured. Barbwire can be very effective as tangle foot as I posted above as well as treble hooks hanging at face to torso level on 25lbs spider wire. Any drainage ditches at the end of your driveway or outside of her perimeter that are close to you need to be filled with sharped stakes or rebar, or covered over with well staked down barbed wire or some other way to keep them from being used as improvised fighting positions against you.