These switch modules use RF relays in a stubless tree switch configuration to provide 50 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.
50 ohm Bandpass of DC to 1.5 GHz. Isolation of -60 dB to 900 MHz.
VSWR = 1.25:1 @ 1 GHz
Switched Power = 10 Watts
SMA or BNC 50 ohm connectors.