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SSB LNA435 preamp and Arrow Satellite Antenna

If I insert an SSB LNA435 preamp between the 70cm antenna and the diplexer will the suppression of the 2 meter signal from a 5 watt HT be adequate so that the preamp will not be fried? Or, should I add something like the Ramsey RF sensing T/R relay to protect the preamp?
Thank you!

73, Al, W8KHP
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