From your description, a filter cannot help. A directional antenna might,
e.g., a loop. Ideally, you need to find the source and fix it there. A
portable radio and loop would help you sniff it out.

Good luck,

Tom

"Warpcore" wrote in message
ink.net...
[snip]
not happen only on one frequency but all up and down the bands, becoming
more noticeable at 13 Mhz through about 15 Mhz regions.
[snip]
Would a filter help - low pass or high pass ? I looked at MFJ, but they
want
$100 a piece for what they offer.