Over a decade ago I purchased a PAR AM broadcast band High Pass Filter. It has a switch to enable, or bypass. It helped attenuate an AM broadcast station tower about a mile away.
A few years ago I purchased a Flamingo+ AM broadcast filter via Amazon (Version 2). I swept each filter to review how wide the skirt was, as well as attenuation at the skirt edges and the AM broadcast range itself. The difference was negligible and may have been slightly better on the Flamingo IIRC. The bigger difference was the price of the PAR $80 versus the
$20 Flamingo filter.
My PAR filter is in a box while the Flamingo filter is inline with my SDR. I have an additional Flamingo filter I use with a different SDR, 9:1 transformer and a bit of wire when I go camping. The smaller size and weight of the Flamingo, price, SMA connectors and performance make it the solution I use. * Please note there is an original Flamingo AM filter, but the one to get is the Flamingo+ V2. Below is a sweep of the version 2 a buyer posted on Amazon.
Below is a sweep posted by PAR for the AM HPF. Pay attention to the skirt (edges) on both of these filters. One may serve you better than the other. Remember, it is not only the attenuation of the AM broadcast band, but whether the edges of a filter will attenuate signals you may want to monitor...or not.
* * One more thing. You can run two filters inline to really clobber the unwanted AM broadcast. The Flamingo+ AM filter I use at home also has an AM HPF in front of it. That special filter is mainly for my Amateur HF radio as I transmit through it, but when switched to the SDR, it benefits from the additional filtering even if just for RX.
