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Change the coax and mount. The chances are that what has happened is the coax has become crimped or crushed where you bring it into the vehicle if its through a door, trunk, hatch etc. That will affect the SWR as the impedance of the coax is determined by the ratio of the diameter of the outer of the centre to the inner of the braid, a gap that gets reduced when you crimp or crush the coax.

Personally I'd do away with a crappy mag mount and drill a hole in the roof and use a fixed mount. Once you've done that then low branches aren't an issue unless you're using a rigid antenna like the Firestik.

[QUOTE="M0GVZ, post: 672118, member: 22312"] Change the coax and mount. The chances are that what has happened is the coax has become crimped or crushed where you bring it into the vehicle if its through a door, trunk, hatch etc. That will affect the SWR as the impedance of the coax is determined by the ratio of the diameter of the outer of the centre to the inner of the braid, a gap that gets reduced when you crimp or crush the coax. Personally I'd do away with a crappy mag mount and drill a hole in the roof and use a fixed mount. Once you've done that then low branches aren't an issue unless you're using a rigid antenna like the Firestik. [/QUOTE]

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