An easy summit in the John Day area is Long Creek Mountain. To access it turn east off of Highway 395 on NF-3940. This turn is at the Long Creek Summit, 44.6789, -119.1309. The turn off the highway is steep, but I believe it is Priusable to 44.6626, -119.0480. From here it is half a mile and 250 ft. of gain on a rough road to the summit. You can drive it with high clearance and your mirrors folded in, if you don’t mind a few paint scratches.
There is a small radio installation at the top, but I did not experience any RFI. There are some small to medium size trees about and I used a small one to secure an antenna pole.
A good coupling with this would be Black Butte, http://www.pnwsota.org/blog/wj7wj/2019-july-15/black-butte-oregon-july-2019
