It's a uBitx. I had this probem since it arrived and when I made first tests with it. A few days later, I built a case from copper plated FR4 circuit board material for it to ensure the shielding is good enough. I shortened and twisted most wires in the uBitx, like the antenna wire and the audio wires to avoid rf-coupling to them as much as possible. This made my problem much better, but it still occurs at some antennas, like the mentioned endfed halfwave.
With my IC726 I used this endfed halfwave antenne quite often and had just a few problems with ist, so I like it. At home I'm not able to put up a wire antenna, so I'm trying to use a magnetic loop.
73,
Ludwig
