Abstract: The invention provides advantageous and reliable loop equipment (60) for establishing a test loop for monitoring the condition of a radio station including at least two antennas. The loop equipment (60) comprises input ports (61, 61'), output ports (69, 69') and a controllable selector switch (62) wherewith the signal of one input port (61') is selected to at least one output port (69, 69'). The loop epuipment is so adapted that its input ports (61, 61') are connected to the outputs of tansmitters (TX, TX') and output ports (69, 69') to the input of a receiver (RX, RX'). Various test loops for monitoring the condition of transmitters, receivers and antennas at a radio station can be established by means of the loop equipment.