Have you checked with the game wardens on Pendleton itself about hunting there? They have very good deer hunting, and I have seen plenty of coyotes there. Just not sure if they allow you to shoot the yotes too.
Also, look out for the buffalo, and don't even think about shooting one. Fun to watch though.
If you cannot find a place on base, get a map of the Cleveland National Forest. Closest access for you would probably be out Route 76 to Palomar mountain. It's probably a 45-60 minute drive until you hit public land there.
Let me know if you have any other qeustions. I know a couple of the base wardens, so I could try to find out about yotes on base.
Here is an inexpenive and effective deer feeder I made recently.
No batteries to go dead, no hoisting it up in the tree, plenty of capacity, very easy to fill - so far, I love it.
I have made two of these and they are easy to build.
An empty 55 gallon drum, some 2x4's, some PVC tubing and fittings, a little bit of hardware and some paint - and you are ready to go.
I designed it so you can stand on the lower rung and fill it - the top is about 6.5 feet above the ground.
It holds about 375...