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I have the Comet sma503 ..I have done a test with it and a factory FT 60 antenna,the 503 does seem to work a bit better ....
.Used a repeater that was fringe area for my location ,had it just a bar or so under half scale on the handheld,put the 503 on and it came up about 2 bars or so on the handheld meter....could access it on the 503 where I couldnt on the factory antenna....I would call it a marginal improvment
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