I have a feeder on a pole with phone line about 6ft above it, I thought I knew how smart squirrels were until one that couldnt get up my feeder, or jump down on it from the telephone wire without hitting the slippery feeder roof, tried to fall onto the feeder by eating through my telephone line. Luckily I saw what he was doing and moved the pole before he ate through my phone line. A cable with weight on a tree will over time cause it harm by stopping its growth where it is forced on the tree. Damage will occur slowly, and a bolt will eventualy rust and leave a hole. My neighbor has killed the top of her tree with a cable. You need something wide to distribute the cables weight. A pole is usualy best for a feeder