I bought an MFJ-269 antenna analyzer with some 160 meter antenna design in
mind. It works fine on my VHF and UHF antennas, but the local 1350 AM
station (which is just a half mile away) interferes when an HF antenna is
connected. The SWR reads 31 and the two analog meters dance to the
station's audio. I tried a home made 1350 KHz notch filter I've used with a
few receivers. The notch filter gets rid of the offending signal, but makes
the 160 and 80 meter readings bad (verified with a dummy load).

Any solutions out there? Is it possible to build a 1350 KHz filter that
won't throw off the impedance reading at 1800 KHz?

Luckily my Kenwood TS-570 is able to contend with the AM station.

--
Bob D. ND9B