Official AOR Air Band VHF Filter. Through attenuator: 4 dB. VHF aerial radio reception band pass filter. ABF-128 (BNC Type). Frequency: 108 MHz to 136 MHz. High performance band pass filter (receive only).
Even though the product now allows me to listen to the airband better than before, you need to be aware that the filter does have a sharp dropout after 128MHz, meaning, frequencies above, will still come thru but with noise.
I bought this product to help with reception in my environment, it has delivered, still, I wonder if, a notch filter would've performed as well.
I use the filter with an outside antenna: a J-Pole cut for the airband, on my third floor balcony. The reception with this antenna, combined with the bandpass filter, does improve reception. However, again, frequencies above 128 MHz, have a sharp drop off and interference creeps in, still usable, better than before, but, I guess this is more the antenna design than the filter's capability. Just bear in mind what frequencies you listen to most, before ordering this.
Since the filter is "fixed" to a frequency range, make sure your antenna has a good dynamic range.