A standalone multi-channel Dynamic Frequency Selection, DFS, master device comprising: a memory (202, 201) to store a whitelist of each of a plurality of 5 GHz radio channels that does not contain a radar signal; a beacon generator programmed to generate a beacon in each of the plurality of 5 GHz radio channels; a radar detector programmed to scan for a radar signal in each of the plurality of 5 GHz radio channels; a 5 GHz radio transceiver coupled to the beacon generator and the radar detector and programmed to transmit the beacon in each of the plurality of 5 GHz radio channels and to receive the radar signal in each of the plurality of 5 GHz radio channels; a switch and an embedded processor coupled to the memory (202, 201), the radar detector, the beacon generator, and the 5 GHz radio transceiver, programmed to perform the following steps during in-service operation of an access point (218, 223) or a LTE-U host associated with the DFS master device: (a) switch the 5 GHz radio transceiver to a first channel of the whitelist; (b) next, cause the beacon generator to generate the beacon in the first channel of the whitelist; (c) next, cause the radar detector to scan for a radar signal in the first channel of the whitelist; (d) next, if a radar pattern is detected, remove the channel from the whitelist; (e) repeat steps (a) through (d) for each other channel of the whitelist; and (f) continuously repeat steps (a) through (e); wherein steps (a) through (e) are performed during a beacon transmission duty cycle which is a time between successive beacon transmissions on a specific channel, wherein the beacon transmission duty cycle is less than or equal to the maximum period between the beacons allowable for a client device to remain associated with the network. a memory (202, 201) to store a whitelist of each of a plurality of 5 GHz radio channels that does not contain a radar signal; a beacon generator programmed to generate a beacon in each of the plurality of 5 GHz radio channels; a radar detector programmed to scan for a radar signal in each of the plurality of 5 GHz radio channels; a 5 GHz radio transceiver coupled to the beacon generator and the radar detector and programmed to transmit the beacon in each of the plurality of 5 GHz radio channels and to receive the radar signal in each of the plurality of 5 GHz radio channels; a switch and an embedded processor coupled to the memory (202, 201), the radar detector, the beacon generator, and the 5 GHz radio transceiver, programmed to perform the following steps during in-service operation of an access point (218, 223) or a LTE-U host associated with the DFS master device: (a) switch the 5 GHz radio transceiver to a first channel of the whitelist; (b) next, cause the beacon generator to generate the beacon in the first channel of the whitelist; (c) next, cause the radar detector to scan for a radar signal in the first channel of the whitelist; (d) next, if a radar pattern is detected, remove the channel from the whitelist; (e) repeat steps (a) through (d) for each other channel of the whitelist; and (f) continuously repeat steps (a) through (e); wherein steps (a) through (e) are performed during a beacon transmission duty cycle which is a time between successive beacon transmissions on a specific channel, wherein the beacon transmission duty cycle is less than or equal to the maximum period between the beacons allowable for a client device to remain associated with the network. (a) switch the 5 GHz radio transceiver to a first channel of the whitelist; (b) next, cause the beacon generator to generate the beacon in the first channel of the whitelist; (c) next, cause the radar detector to scan for a radar signal in the first channel of the whitelist; (d) next, if a radar pattern is detected, remove the channel from the whitelist; (e) repeat steps (a) through (d) for each other channel of the whitelist; and (f) continuously repeat steps (a) through (e);