Back in 2014 I did some testing on my ST2 antennas to see just how directional they are.
Part of my testing was done on SatCom frequencies.
While doing that, I decided to compare them to my X-Wing antenna.
In the images below, you'll see that on each of two ST2 antennas pointed East and West (on the side of a mast), some of the signals were just barely noticeable at all.
(If you only depended on one of those antennas, in only one direction, you wouldn't even know the other signals existed.)
On the X-Wing, they were all there and strong.
Very nice performance!
Both screen captures were within just a few minutes of each other.
There's a little more info in my older post here:
http://forums.radioreference.com/sc...300420-st-2-antenna-question.html#post2273513
Rich
Two ST2 antennas, pointed East and West, simultaneously using two instances of SDRSharp.
And on my X-Wing:
.