A radio station comprising: - a processor; - a memory coupled to the processor; and - at least one communication interface (306, 312, 318) coupled to the processor, the at least one communication interface comprising a radio communication interface, wherein the processor is configured to: - receive one or more capability announcement messages from one or more other radio stations, wherein a given capability announcement message comprises an identifier of a given radio station that transmitted the given capability announcement message and a network-access status of the given radio station; - analyze the one or more capability announcement messages to gather analyzed communication-capability information indicative of the one or more other radio stations that are available for communication and respective communication capabilities of the one or more other radio stations; characterized in that the processor is further configured to: - update a station map, maintained locally at the radio station, wherein the station map is configured to store the communication-capability information; - use the station map to select among the one or more other radio stations a target radio station for accessing a communication network; and - transmit one or more capability announcement messages to other radio stations; and wherein when analyzing the one or more capability announcement messages, the processor is configured to measure quality of received signal of each of the one or more capability announcement messages and to determine a propagation mode of each of the one or more capability announcement messages by determining whether a given capability announcement message was received as a surface wave or as a sky wave. - a processor; - a memory coupled to the processor; and - at least one communication interface (306, 312, 318) coupled to the processor, the at least one communication interface comprising a radio communication interface, wherein the processor is configured to: - receive one or more capability announcement messages from one or more other radio stations, wherein a given capability announcement message comprises an identifier of a given radio station that transmitted the given capability announcement message and a network-access status of the given radio station; - analyze the one or more capability announcement messages to gather analyzed communication-capability information indicative of the one or more other radio stations that are available for communication and respective communication capabilities of the one or more other radio stations; - receive one or more capability announcement messages from one or more other radio stations, wherein a given capability announcement message comprises an identifier of a given radio station that transmitted the given capability announcement message and a network-access status of the given radio station; - analyze the one or more capability announcement messages to gather analyzed communication-capability information indicative of the one or more other radio stations that are available for communication and respective communication capabilities of the one or more other radio stations; - update a station map, maintained locally at the radio station, wherein the station map is configured to store the communication-capability information; - use the station map to select among the one or more other radio stations a target radio station for accessing a communication network; and - transmit one or more capability announcement messages to other radio stations; and