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Angle absolutely can affect RCS.

Retracting landing gear, retracting flaps, etc. can reduce RCS.

For military aircraft, closing of weapons bays that were previously open would reduce RCS.

In an extreme case, jettisoning of external fuel tanks and weapons can reduce RCS.

Thanks. I was also wondering if radio wave propagation might have been a factor.

It'd be nice if someone put together a timeline that includes these sensor data so we could build a better model of the situation.

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