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LM7171: Stability

Part Number: LM7171


I am using the LM7171 as a high frequency high gain amplifier. Below is my circuit configuration I am using. I put a 2pF compensation capacitor as suggested by the data sheet and this works initially. When i connect a 50 ohm impedance bnc connector to the input the oscillation returns. Attached is a screenshot of that oscillation. How would I model the bnc connector to adjust the compensation capacitor?