I guess I pushed it too far this evening with my P4. So I'm flying across the Ohio River directly across from Louisville Kentucky. I'm on Indiana side of river and it's about a mile across the river to get to the buildings. Dumb me got lined up to go between two 500ft tall buildings in town. Started driving right between them and totally lost connection almost instantly. Had 70% battery left so I thought no problem should be coming home. But return altitude was set at 120 meters. Not tall enough if it has to go over the tallest building. But it should not have hit it because of Object avoidance right? It should have just stopped and tried to go around or just hover there until battery ran out right? I was using Windsurfer's too btw. Which I don't think I would have got as far over the city as I did without them. But they did not help when it ducked behind 500ft tall building at over a mile out. My stupidity for sure But anyway, it never came back at all. So I drove over to downtown Louisville and walked the streets and even talked to two security guards and gave them all my info. All of my info was on the bird too. So hoping I get lucky and get a call on it. I'm almost more pissed because of the nice footage I had of barges going up and down river and the awesome sunset on the skyline was cool too. I will also never set my maximum altitude to 400ft ever again either. I was trying to climb to get just above those bulidings which may have kept my RC control. But with max altitude set at 400 it would not let me climb as I was driving it forward. This def my fault and I should have known better than to try flying these buildings and being so far away from me. Lesson learned I guess. Be glad to upload the files from my Ipad if I knew how. Help on that if possible? Now what to do next? I was ready for an Inspire anyway. As much as I freaking love the P4, I'm ready for a little better sensor with better stills too!