I will soon install my A99 with Ground Plane Kit. I need a mast pipe that will be 36-feet tall. It will be cemented into the ground, bracketed to side of house, and appropriately grounded. About 10 feet of the pipe will extend beyond the roof line, with the A99 antenna on top of that. I'm not sure if I need to use guy wires for that portion above the roof.... ?? Anyway, I'm thinking Schedule 80 pipe at 1.5 inch diameter will be plenty strong. Where do I get such pipe? A local metal manufacturer wants to charge me $1,800 for such a pipe! Do you have any other recommendations for such a pipe?