Budget?
Coyote level stuff can be pretty reasonable. Observing people that are trying to be sneaky is going to take better gear.
The current standard for .mil is an
AN/PVS-14 If I was worried about people that's what I'd use.
I have a 'yote gun with an older (3 years or so) Gen 1+ scope on it and it's range limited to about 50-100yds unless it's a pretty bright night.