A distributed loaded antenna system including a monopole antenna is disclosed. The apparatus receives discovery resource information from a base station, sends a discovery signal based on the discovery resource information, and receives from at least one user equipment a request for relaying with the base station based on the discovery signal. The device also includes a detector means for detecting an unacceptable condition of the wheel and emitting a signal dependent upon such condition and a transmitter for transmitting that signal to a receiver. The unit is compatible with a plurality of refrigerant types without cross-contamination of the refrigerant due to the oil-less compressor and conversion cycle whereby the vacuum pump is activated to remove residual refrigerant from the unit.