Well I put in the note about the use of the 91-xg in cold, windy places to give you a feel for that. Plus, AD will work with you if something breaks.
I'll bet that multipath performance between the two will be similar. AD posts the antenna pattern at frequencies throughout its beamwidth while Fracarro posts only one. At some point, you can't fight physics - I'm pretty sure the Fracarro's patterns will vary in the same way.
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