I have a Comet SBB2 NMO mounted on the roof of my car. It's attached to a Breedlove 504 Mount and 15 feet of RG 8X running to the front of the car. The coax connects to the mount with ring terminals. The leads on the coax are as short as I could make them. About the same length as a small ring terminal. 2 meters is fine, but I'm still getting high SWR on 440. It's at or just above 2:1 between 440-450 MHz. It dips to 1.8:1 around 445 but quickly goes back up. I've made every adjustment possible with no effect. Ironically, when I used a lip mount on the hatch, I had the opposite problem. 440 was great, 2 meters was not. At this point I'm not sure where the problem lies. Continuity between the pl 259 and the mount are good. Since the Breedlove mount doesn't have "teeth" on the nut, I sanded the underside of the roof to get a better ground connection. Im using the Breedlove mount because rather than drilling, I'm using the factory hold for the OEM sharkfin antenna. It's a square hole that I thought would be much bigger than it actually is, so I bought this mount just in case. Any ideas are appreciated.