Sharing of antennas by base station nodes of telecommunications network

A first radio base station (28₁) and a second radio base station (28₂) are co-located at a base station site (20) and share the base station site's common antenna (22). The common (shared) antenna is connected through an amplifier (32₁) of the first radio base station (which serves as a master amplifier) and an antenna sharing unit 50 to remaining components (34₁) of the first radio base station, and also through the master amplifier and the antenna sharing unit to an amplifier (32₂) and remaining components (34₂) of the second radio base station. The antenna sharing unit (50), also known as the "coupler", includes a tower mounted amplifier simulator (64).