There's an NMO thick plate mount that's also the correct diameter so you dont have to drill your bumper. I have 3 of them. Let me find you a link.I think this may work I need to check the thickness, as this one is only good out to 1/8" and I may have to bore out the opening to accommodate 3/4".
My intent is to run signalstuff's new automotive antenna.![]()
NMOHPCNRPSMM518: 3/4 Thru-Hole High Frequency NMO Mount with 17 Ft. ATX195 Cable & RP-SMA Male Connector Installed
This TE Connectivity Antenex 3/4 Thru-Hole NMO Mount is optimized for vehicular roof mounting of an NMO type antenna. Typically used with VHF or UHF or high-frequency (900 mhz+) antennas, the NMOHPCNRPSMM518 includes a 17 Ft. ATX195 Cable and RP-SMA Male Connector Installed If this is not the...www.arcantenna.com