Here are some pics of the bridge, and test results on the VNA, and then using the SH 124B + TG
I am measuring directivity by normalising with the test port open, attaching a 50 ohm load onto the test port and then making the measurement.
Edit: sorted out the pics, note that I was tweaking the tuning tab all of the time so the images show different tunings.
Bridge pics
![](https://s17.postimage.org/prtticpqz/IMG_20171213_205309.jpg)
![](https://s17.postimage.org/aj3w4r3u3/IMG_20171213_205458.jpg)
![](https://s17.postimage.org/qhcluv36z/IMG_20171213_205516.jpg)
Directivity tuned for 6GHz
![](https://s17.postimage.org/j1dc94knf/IMG_20171213_205735.jpg)
Directivity tuned for best under 3GHz
![](https://s17.postimage.org/s95kpv20b/IMG_20171213_210200.jpg)
Return loss
![](https://s17.postimage.org/efh80s6u3/IMG_20171213_210527.jpg)
Difference between open and short
![](https://s17.postimage.org/by5gtja2z/IMG_20171213_210711.jpg)
Attached images show the directivity measured on the Signalhound.