Thanks to everyone who sent suggestions on my problem. Those who did not receive a personal thank-you note is because mail to you bounced.
I thought it might be helpful to post a follow-up with links. In no particular order: http://www.arraysolutions.com/Products/BCB%20RF%20Filters.htm http://www.n1nc.org/Filters/160meter/ http://www.cliftonlaboratories.com/z10020_am_medium_wave_band_reject_filter.htm http://www.dlwc.com/ http://www.rescueelectronics.com/RF_Filters.html (note: may be able to custom build HPF) http://www.parelectronics.com/bcst-hpf-specs.php http://www.universal-radio.com/catalog/filters/4426.html http://www.morganmfg.us/radio-products/bcb-interference-filters/ http://yu1lm.qrpradio.com/bp%20yu1lm.htm http://www.cliftonlaboratories.com/z10022a_high_pass_filter.htm http://www.ac0c.com/main/page_antennas__homebrew_clifton_labs_z10022a.html ... Final comments on my specific issue: The overwhelming consensus is I should not be having anywhere near this magnitude of problem with skywave signals. I agree! But I have been chasing this on and off for years and have been unable to identify a specific problem with my station. I don't know what else to do but throw money at the problem and hope to cover up the symptoms of what surely is an equipment malfunction. I have ruled out building. I build a lot of stuff, but filters would seem to require test equipment I do not have access to. Flying blind is usually a good way to crash. :-) I am guessing my primary problem is mixing of signals in the mid to low part of the BC band, and will most likely opt for the filter with the best attenuation at those frequencies. I do not seem to hear anything particularly strong at the upper end of the BC band anyway. 73, Paul N1BUG _______________________________________________ UR RST IS ... ... ..9 QSB QSB - hw? BK