Tuning the 6m Delta Loop is relatively easy. It is similar to tuning a dipole antenna. If your antenna is to high in frequency, then you lengthen the element. If your antenna is low in frequency, then you shorten the element.
The best way to tune is with a swr analyzer. I use an older MFJ-259B. I have seen several on amazon for relatively cheap and plan on trying one out. Once i get my hands on one, I will post the results. Even if you do not plan on building a lot of antennas, a swr analyzer is a valuable tool.
Before attaching this antenna to my transmitter, I am going to experiment more with the matching. The measurements for the 75 ohm antenna where based off another person’s calculations. Since the velocity factor of cable varies depending on brand and model of the cable, This portion will be recalculated. Once this is done there will be future testing and results will be posted.
If you decide to build this antenna with the existing matching design. Make sure to waterproof your connections on the matching section. First use a high quality rubberized splicing tape and then wrap with high quality electrical tape. Some times, I will even put a nice thick layer of liquid tape over that. 3M has a nice selection of good tapes for waterproofing.