These switch modules use RF relays in a stubless tree switch configuration to provide 75 ohm impedance modules.

CXR/2×2-G Modules Often referred to as Transfer or baseball switches.
They have a Normally Closed (NC = A-B, C-D = OFF) and Normally Open (NO = A-C, B-D = ON) Position.
75 ohm Bandpass of DC to 1.2 GHz. Isolation of -60 dB to 800 MHz.
VSWR = 1.25:1 @ 1 GHz
Switched Power = 10 Watts
BNC or SMB 75 ohm connectors.