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Thadde, I think you have seen some pretty good suggestions here so far, but I might add that such calculations have been around for many years, maybe even as far back as Maxwell and Ohm. It has been just recently that NEC took such algorithms and applied them to computers. Now we have fairly cheap devices that can get you close to seeing such with the hand held field devices as noted.

 

IMO, if you use one of these field type devices, you might find it very beneficial to use it right at the feed point for best results, but I'm not sure about the possible range and conditions you will experience with the starting match, so even that could be iffy if not in the range the device can measure and report accurately.