This active antenna is designed for VHF receive-only purposes. It is lightweight, rugged, and can be used to feed up to five receivers. When the d.c. voltage for the active antenna is not provided by the receiver, it may be supplied by either our AAX1 or AAX5 Power Supply/ Splitter Box. The AAX5 is recommended when the antenna is required to supply more than one receiver. The receivers can be a combination of navigation types, SSB, broadcast AM/FM and Fax.