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Internal antenna is better, external antenna should not be a problem. I got an external antenna GPSMAP 178 unit without the antenna. What I did is I got a BNC connector from RadioShak and connected a piece of copper wire to it. Done. No WAAS but good enough to 20 ft accuracy. It'll do untill I get a cheap antenna from somehwere. But I asure you, you can't go any cheaper than this! The only caveat is it takes very long to get a consistent 3D signal.
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