I'm selling an L-COM 900Mhz 8dBi antenna. I bought it at ReadyMadeRC a couple of years ago but have since moved away from using 900Mhz for my video.
... and the manufacturer's page:
This antenna is in perfect condition and when purchased new it costs around $40 plus shipping. I'm selling this one for $25 shipped via Priority Mail with tracking. I did mark on the label that this was a 900Mhz antenna so I wouldn't confuse it with the other antennas that I own and I've shown that in the pictures.
I was using this for video but I'd imagine that it does a pretty good job with the 915MHz telemetry units too. :) Full disclosure though; I have not tried that.
US addresses only please.