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".
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
My intent is to run signalstuff's new automotive antenna.