Thanks for thinking along, what you suggest I have already done in the past, the antenna here is a 2x20m dipole and tuned 1:1 with the s-matsch I a symetric line.?
In the shack there is almost no HF to be detected (some is always present) I also removed the 7805, which gets very hot, from the Raduino print and provided it?
with a large heat sink and added an extra 4500uF capacitor at the output, but all without result, It is driving me crazy, hi