ScannerMaster just tweeted this out, too. The old "Radio Shack 800 Mhz Scanner Antenna" is, apparently, the Remtronix antenna. And now there is an SMA version.
I've had the BNC version for over a decade on my BCD396T, 'XT, and now BCD436HP. Even with the addition of the SMA-BNC adapter, I can say that this antenna out-performs the stock Uniden antenna on all three radios.
It's funny that this thread is here as I am right now, in another browser window, looking for the best price. Scannermaster is $33.70 shipped ... Universal Radio has a cheaper list price, but won't tell you shipping up-front. May just go with Scannermaster.