This stuff is straight forward. Get as much power on the transmitter as possible as a bit of assurance.
The secret is the high gain antenna. The Yagi is the highest gain. A decent one is just under a 100 bucks unless there is some kind of sale. They are very directional. I suspect it may take a person at both ends during set up. Not sure though?
The next secret is pure line of sight. No sage brush and stuff. Shouldn't be a problem.
Cameras are dirt cheap if you snoop around the security sites.
The big AM I have will most probably force the issue.
That First Class FCC license I got years ago, is finally coming in handy.