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Any filter, whether an FM filter or an HLSJ, will have an attendant noise figure (insertion loss) in the spectrum that is of interest in it passing. It's unavoidable, but the best course is to limit it as much as possible.
Either a Pico-Macom or Holland HLSJ or our (Antennas Direct) FM Filter would be suggested to try out, I would not use the Radio Shack filter as it cuts in at a higher frequency and would affect 89.1 very little. If using the HLSJ, terminate the unused port.
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