Hi Jan, Sorry to learn of your problems and appears really annoying especially as you have carried out an equipment change. Not trying to teach you as you are an expert with lots of experience in operating amateur radio on many bands and modes. But please consider the following. It is hardly the best time with the weather in this part of the world for outdoor work - assuming that it is similar at your location. Presume that you have "separate" antennas for each band - I wonder if perhaps terminating with a dummy load at the antenna end shows the same effect. Also of course you could carry out the same check at the equipment end ( I am referring to the UHF feeds of course in both cases ) and even move the dummy load around the equipment area. It may not be a pointer but it may also perhaps show if it is due to your new equipment, feeder or antenna. Wish you luck and I am sure that you will get many suggestions and pointers about the concern. Regards Ken Eaton GW1FKY