I want to put a Mosley TA 33 Jr. that weighs 21 lbs. on a 36 ft. tubular mast. My rotor will be at the bottom of the mast. I will put a bearing that attaches to my house by a bracket at 16 ft. Will it be possible to get some size of aluminum tubing to use that can stick up 20 ft. unsupported that will hold the antenna? Thanks, Terry, N7TB