I noticed some HMMWV´s got an extra rack for antenna bases. These vehicles were M998 2-door troop/ cargo carriers.

Anyone knows the designation or NSN of the part?

NSN #: 5340-01-197-5470 is very similar.

Thants Rob, but I was referring to the frame that is underneath the antenna mount. Could it be something “scratchbuild” b the unit?

Two more images.

That frame looks like it could be a part of the kit for the missile racks.

I think it was also used witrh other M998 2-door variants. this 2019 pics shows another RT antenna rack.
Seen on a M1097 from 173rd Airborne.

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This one is different; it sits up higher. All in all, this inquiry is very interesting.