How far is the monitor antenna installed in a DVOR system?

In a DVOR (Doppler VHF Omnidirectional Radio Range) system, the monitor antenna is typically installed at a distance of about 1.5 to 2.5 nautical miles from the DVOR transmitter. This distance allows for effective monitoring of the signal quality and performance while minimizing interference. The exact placement can vary based on terrain and local regulations.