I've sold a few of the Centurion EXB-118-BNX antennas to people who looking for replacements for their aviation handhelds and to scanner users. I also use one on my Icom R10 when travelling through airports. It works pretty well; far superior to the ducky that comes with the R10. It doesn't have any gain per se, but you will notice a definite improvement over a standard scanner rubber duck antenna.
The EXB-118-BNX does 118-127MHz, and the EXB-127-BNX does 127-136MHz. I would suggest the EXB-118-BNX since most of the traffic is still in the lower half of the 118-136MHz range. It will listen just fine from 127-136MHz, too.
Yes, you do have to buy Centurion antennas through a dealer. I also happen to be a dealer for them. The price for either antenna is $17.00.
Please let me know if you have any questions.
Thanks,
Jeff