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| I am attempting to post a pic of my A221 mounting on my bins and the 400 MHZ antenna location on the elevator. I have not had issue with multipath on this mounting. I am able to work up to 18 miles away in 38" beds and have repeatability. GPS accuracey is +/- 2cm at the base plus 1 ppm for horizontal accuracy. 1 inch is 1 part per million of 15.78 miles and vertical accuracy is double that (+/- 2cm plus 2ppm). So at 15.78 miles you could expect +/-1"+2cm accuracy to either side of you AB line at the antenna (other issues of accuracy tend to be implement related).
 (A221 location-small.jpg)
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 A221 location-small.jpg (27KB - 151 downloads)
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RTK base station mounting question...
