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One way to do this is with the setup below. The 10.7MHz SSB filter will only be a few kHz wide
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I would have to find a narrowband crystal with known datasheet, having values of Rp and Cp. Applying transformation to find Rs and Cs, the LC matching pads can be found by using the Smith chart.
The HP spectrum analyzers such as the HP 3585A uses 1M ohms impedance transformation buffer amp at the input with a impedance selector switch. I suppose the buffer amp would improve the signal-to-noise ratio but also add to the TOI contribution in the chain.