For what it's worth, I've tried several types of Austin antennas over the past years. The specs make them sound great, but I've never been impressed with how they actually work in the real world. Of course, your mileage may vary.
That was my experience with one of the Austin Condors. I purchased one quite some time ago, to use on one of my 396XTs. At that time, most of the cities and agencies of interest to me were using conventional VHF-high or UHF frequencies.
I did not see any improvement in reception on any of the more distant stations, and for some, it was almost worse than the generic OEM antennas. I tried it on several of my other scanners, with a different set of frequencies, but I was still less than impressed with its performance. It was relegated to my ‘junk’ drawer, and still there gathering dust.
While it did not work for me, there’s enough comments from members who did see better results. So, it may work for some areas. Perhaps the one I got was somewhat defective, or something about my agencies of interest that the Condor did not handle well.
As always, YMMV.