The LGMM-EXT-R low-profile panel adapter kit allows the installation of LGMM and LPMM MIMO antennas to ridged or uneven vehicle roof surfaces. The easy-to-assemble kit is comprised of a long adaptor, nut, washer, and semi-closed EPDM foam pad. The antenna and pad fit together and are compressed to mold to the contours of the mounting surface. The pad seals the mounting hole, keeps out dust and moisture, and offers a pleasing aesthetic look.