When I had set-up T-YSWG2 using the USB dongle, I made quite a few antennas using sites such as
http://www.balarad.net for ideas and using RG6 Coax (couldn't get my hands on RG58 nor LMR400). I've found the 8 element to be far more less susceptible to noise, 12 elements can get better range but also more noise (with the dongle, it doesn't handle it too well). Height of the antenna is also important (higher the better but a
DA will be needed for anything 1.8m higher then the building).
My original 8 element (not 100% correctly made), which also lacked height.
Set-up, the set-up was similar with the 12 element.
8 element range (Screenshot)
12 element range (Screenshot)
To be honest, I have no idea if I was using a 8 or 12 element, but I did relocate the antenna slightly more to a clearer spot but also with a little more height.
Set-up
Range (Google Maps)
My very last build so far us the 8 element CoCo with 68mm spike.
Antenna set-up
Range(Google Maps)
Since hosting a FR24 box, I haven't really being using the USB dongle as much for ADSB but I have been meaning to make a Airband antenna.