The Sennheiser 576131 is a monopol BNC style replacement antenna that works with the following Sennheiser mains-powered wireless receivers and transmitters in the 470 to 862 MHz range.
Fits:
EM 100 G3 receiver
EM 300 G3 receiver
EM 100 G4 receiver
EM 500 G3 receiver
SR 300 G3 IEM transmitter
XS EM10 receiver
EM-XSW 2 receiver