Honest John wrote regarding multipath:
Is that the same thing as what ham radio operators of 2 meter repeaters call
"intermod" ?

No. Multipath is from the same signal arriving via two different paths
(typically resulting from a reflection), one of which is delayed enough
to cause phase cancellation.

Intermod is from separete signals of different frequencies mixing in
some nonlinear componenent either in or near the receiving apparatus,
producing signals that are the sum and difference of the two frequencies.

--
John Miller