This is an acrylic cover that mounts on top of the Compact ATR aluminum base. The kit includes 4 3" bolts and nuts to mount it to the compact ATR aluminum base. The picture shows the cover with its protective paper on it, which peels off.
900 MHz Rubber Duck Antenna - Male Type F
900 MHz 3 dBi Rubber Duck Antenna - RP-SMA Plug Connector