Amazon.com: U-Bolt Pipe Clamp U Bolt Assembly For Outdoor Antenna,secure an antenna mast (as well as pipes and ropes) of up to 1 5/8” diameter 2pcs : Electronics
4 1/2" Exhaust Muffler Clamp U-Bolt Saddle Style For 4.5" Pipe 5/16" R – Bear River Converters