I don't have equipment to check the performance of this board, but that has already been done. I've never seen a board with such thick coatings and with the data printed on the coating. There will be no question of what this is in the future. I did put it on the various SDR boxes I have around that cover those frequencies and it picks up more signals than I can identify. N0UU
Glad your happy with it. I am a big fan of parts with the basic specs printed or engraved on them so once I had the reliable measurements from AntennaTestLab I had to do it. I used to use old HP directional couplers with the full S parameter charts printed on them, Really handy. I hate having to look on the internet for an obscure part number every time especially if there is no manufacturer name or they went out of business.
I received the Vivaldi antenna on time and without any problem. It was properly packed and protected. The antenna is exactly what was described by the seller and it is superbly documented online. Thanks for everything.