A trunk lip mount is usually furnished with RG-58 cable, not RG-8 which is considerably larger. Motorola's NMO mounts are supplied with a double-shielded RG-58 (small diameter) cable which I believe is used on 800 mHz installations. The short run is not long enough to seriously degrade the received signal. RG-8 cable is too large to fit in a trunk lip mount/installation. Also, no coaxial cable will ever "improve" a received signal; the antenna might have the capability but the cable will not.
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