The concern here is the shielding effect of a metallic covering or a metallic shrinking wrap.

Sheilding effectiveness depends on the electrical conductivity ot the material.

A foil or aluminum (food wrap as often used in an oven cooking food) is an excellent shield.

As it was suggested a while ago in some thread, connect the receiver and some servos to it and wrap the receiver in one layer of the covering material. Proceed to make a PROPER range check.

If all works fine then this material can be used for covering.

There is no way I can think of to make a conductivity measurement of this covering material because some plastic layer may be on the surfaces (both faces).

Its conductitvity might be next to nothing or it can be quite good depending on the density of the metallic flakes or powder used in its fabrication.

Anyone with a better idea ?

Zor