rf noise

Hi all, I became the owner of an ICOM-R75 awhile back, great radio, love it. There seems to be one problem though... Right now the antenna I'm using on the R75 is a Par EndFedZ, seems to work well with the radio, it is strung up about 45 feet. But when I'm scanning through frequencies, every few...

Well, I woke up to this crud on the radio this morning :-( The strongest being centered around 7.4 mhz. I ruled out anything local to my house by killing the main breaker, the RFI was still there. Note the "DNA" pattern in the first image - anyone recognize it? It sounds like constant...