I have a really bad noise on 17m (and sometimes other bands) that really makes it hard to hear signals at times. It sounds like some sort of electrical crud from consumer electronics, or something like that. It might be powerline noise, but I really don't think so. Anyways, I know the best solution is to remove the source of the noise, but that isn't always possible.
Any suggestions or experiences would be most welcome!
MFJ 1026 Noise Canceller. Uses an out of phase signal to lower/eliminate the interference. Have a look on the Youtube videos. I think that in the UK at least it is almost becoming a requirement for anyone living in an urban area wanting to work HF on the lower bands.
Failing that, you're looking at the Flex.