I have found an SHP-150, but no SHP-175's (also, several 200's, and a couple of 500's).
Why do you say the SHP-150 isn't enough? The blue peak at 10*fmod in your plot looks like it's at -12 dBm. -13 dB on top of that will leave that peak at -25 dBm. That should be enough to keep us from saturation, right? It's not a lot of headroom, but we can give it a twirl until a 175-er comes in.
Koji also suggests putting in a 110 MHz notch, combined with either an SHP-150 or SHP-175, although we'll have to measure the combined TF to make sure the notch doesn't spoil the high pass's response too much.
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Minicircuits' SHP-150 only has 13dB suppression at 110MHz, which would not be enough either. SHP-175 has 31dB suppression at 110MHz and 0.82dB at 160MHz, maybe this is what we want.
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