RC2 covers vs. internal antennas signal obstruction

[TT3023]

Hi all. So has anyone got a good feel for which (if any) of the aftermarket covers/sunshields for the RC2 cause minimal (if any) signal degradation to the internal pair of antennas? These covers usually wrap around in that area and some degradation (depending on the exact plastic used and density) would seem not impossible. Anyone really look at this? Any recommendations? Thanks, and best for the new year!