Got a couple of these: http://www.amazon.com/dp/B005H488Y4 which are RP-SMA to SMA adapters which are generally the thing you want to use one of the zillion GPS/WiFi anntenna's with the HackRF. Since a lot of antennas show up in surplus shops this was an inexpensive way to make sure they would talk with the unit. I use a 1/4" drill to remove some of the foam from the "holder" for the HackRF1 in the box and drop one of these into that hole, so it is always nearby.
--Chuck
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