I thought I should put a few pointers here based on our recent activation of Triode Mt.
The property is privately owned by Inland Empire Paper Co. They sell a per-day access permit from their web site.
We parked at the gate (47.750860,-117.118169) and started hiking. The route switches back and forth and we ended up taking 2 shortcuts that are visible in purple on the map below. The longer "shortcut" closest to the gate was where we missed a turn on the way back down. The blue track is courtesy of Matt W7MDN.
The summit was a jumble of rocks which we didn't bother to scramble up since there wasn't much room to work from up there but instead setup 20' or so below the summit.
NOTE: we did run across a camouflaged turkey hunter with a shotgun. I could hear him running a call as we passed by on the trail. Had a pleasant conversation with him and continued on but be aware that there might be others like him up there. There was a pickup truck at the gate when we parked.