The Diamond SG7900NMO is a horrible antenna. Not even a month on the car and part the Phase Capacitor - Part# 17704 failed. Antenna just came apart and unable to reconnect. I sent Diamond an email requesting a replacement part. I had my suspicions about the design and I should have listened. Do not purchase this antenna unless you have money to burn. When connected it worked great, but not so well when it fell apart.