Cut cable recently - Bills were to expensive. Purchased a RCA yagi outdoor tv antenna. To test it out - I put it on a bed inside the house, connected to 25 feet of RG6 Quad shield coax. Making sure I had it pointed in the right direction, I was picking up 10 stations, a few were around 50 miles away. Nice signals with a few breakups - but pretty solid reception. So thinking that I was getting nice signals inside, I thought I would get much better reception after mounting it off the side of old tv tower outside. I had to add 6 feet more cable ( 31 ft total length ). Used metal conduit bent 90 degrees to side mount to outdoor tower. Antenna now 15 ft above ground. Came in to test tv signal - but to my surprise, was only able to pick my local PBS stations, but nothing else. Tried adjusting directions of antenna - but no luck. There are no other obstructions, buildings - trees etc. Can not understand why I can get reception a couple of feet off ground inside the house, but now mounted outside 15 feet up, I cannot receive the longer distant stations. Any suggestions will be greatly appreciated. Thanks.