Pinit RFI MB9 Magnetic Base; 5m No Connector SKU: MMB9-5M-NC Magnetic Base with moulded MB9 style antenna base with 5 metres of low loss RG58 style cable. Login for pricing DESCRIPTION SPECIFICATIONS PDFS, DOWNLOADS & VIDEOS The magnetic base is 5/16 Base to suit most Mopole antennas. Suit antennas with 5/16 26TPI female thread. Includes rubber boot to protect the vehicles paint work. Allows antennas to be transferred from car to car with ease.