This is certainly a great ground connection for the coaxial cable shield currents but the capacitive coupling of a magnetic antenna works pretty well too.
													
																	Nmo on roof. 
									
	
		
	
																	As we move from left to right you will see a nmo mount to be used in a inch diameter hole with a length of coaxial cable attached. 
																	Get 10 flat rate for us shipping and 45 flat rate for international shipping. 
																	This install might not have been possible with the normal 3 4in mount but this mount was easier to maneuver into position. 
																	The nmo mount has teeth on the bottom piece which make a good firm connection to the metal of the roof top. 
															
													
									
	
		
	
																	This would be used to mount an antenna on a roof of a vehicle. 
																	Nmo mounts come in various styles and the only difference is how the nmo connector is terminated on the opposite side.