Love loops. Directions are good for adjustments. I measured swr AT THE ANTENNA and got 1.2 to 1 with quality, short coax. Always measure as close to the antenna as possible.

When I initially received this antenna, and adjusted lengths according to the instructions, I found that there was a VSWR of about 2.5 on 144 MHz. Sweeping over several 10's of MHz with a VNA showed no obvious resonance. Looking at the antenna however, I felt it a little odd that the grounded block (which the connector is attached to) was not in the centre of the dipole, so I adjusted it to be so by eye. Without changing the position of the gamma match I found I now had a sharp resonance and reducing the match length from 9.2cm to 6.2cm gave me close to a VSWR of 1 at 144.3 MHz. So, their 9.2cm on the diagram is to be reduced to 6.2cm and their 8.7cm increased to 12.5cm. I have neither had the chance to use it outside yet and I haven't made sense of what I am seeing on 70cm, but hope this will help someone. It is very well made, I just don't understand their tuning lengths!

This is a very good loop for 2 and 70cm. It will also work in to the PMR band (horizontal and not vertical) So good for SSB on 2 and 70.
With some play you can get the SWR down to 1.1 without problems.
Out of the box settings given with the antenna are good but I found I needed to change some in order to drop the SWR. This will be because of the type of mast it was on and Hight.
Near by objects will affect this and you may need to retune the antenna.
Think of the gap on this antenna as being the front and the back being the Gama match side.
The gains on this front to back are around 5-7 dbi and on the sides around 1.5dbi so very good antenna.
When mounting the antenna think about where you want more TX power going.
If you wish to have more signal going north to south then point the gap north.
If you wish to have more gain east to west point the gap east.
Again this is a very good antenna made out of "SOLID" Ally. very small foot print and very strong.

Initially I feared this purchase was a mistake because I could not get the VSWR below about 2.5:1
However, when I tried it in the field I managed to achieve multiple distant contacts with just 5w SSB on 2m. Haven't had an opportunity to try it on 70cms.