A transmitting device to operate in a wireless network and including: a processor, a memory, a radio and one or more antennas; wherein the radio is configured to: transmit to a receiver a request-to-send, RTS, wherein the RTS is formatted as a control frame that includes: a Frame Control Field indicating the RTS; a Duration field indicating a time period during which devices other than the receiver should refrain from transmitting; a RA field indicating an address of the receiver; a TA field indicating an address of the transmitting device; a Frame Check Sequence, FCS, field; and the RTS further indicating the channels sensed as free by the transmitting device; and receive from the receiver a clear-to-send, CTS, indicating one or more channels sensed as free by the receiver that are a subset of channels sensed as free by the transmitting device; and transmit to the receiver only on the one or more channels, characterized in that the radio is configured to transmit the RTS that requests a reservation for multiple channels sensed as free by the transmitting device, wherein the multiple channels include a primary channel, wherein the RTS is transmitted on the primary channel, and wherein the one or more channels include the primary channel. a processor, a memory, a radio and one or more antennas; wherein the radio is configured to: transmit to a receiver a request-to-send, RTS, wherein the RTS is formatted as a control frame that includes: a Frame Control Field indicating the RTS; a Duration field indicating a time period during which devices other than the receiver should refrain from transmitting; a RA field indicating an address of the receiver; a TA field indicating an address of the transmitting device; a Frame Check Sequence, FCS, field; and the RTS further indicating the channels sensed as free by the transmitting device; and receive from the receiver a clear-to-send, CTS, indicating one or more channels sensed as free by the receiver that are a subset of channels sensed as free by the transmitting device; and transmit to the receiver only on the one or more channels, characterized in that the radio is configured to transmit the RTS that requests a reservation for multiple channels sensed as free by the transmitting device, wherein the multiple channels include a primary channel, wherein the RTS is transmitted on the primary channel, and wherein the one or more channels include the primary channel. transmit to a receiver a request-to-send, RTS, wherein the RTS is formatted as a control frame that includes: a Frame Control Field indicating the RTS; a Duration field indicating a time period during which devices other than the receiver should refrain from transmitting; a RA field indicating an address of the receiver; a TA field indicating an address of the transmitting device; a Frame Check Sequence, FCS, field; and the RTS further indicating the channels sensed as free by the transmitting device; and a Frame Control Field indicating the RTS; a Duration field indicating a time period during which devices other than the receiver should refrain from transmitting; a RA field indicating an address of the receiver; a TA field indicating an address of the transmitting device; a Frame Check Sequence, FCS, field; and the RTS further indicating the channels sensed as free by the transmitting device; and receive from the receiver a clear-to-send, CTS, indicating one or more channels sensed as free by the receiver that are a subset of channels sensed as free by the transmitting device; and transmit to the receiver only on the one or more channels, characterized in that the radio is configured to transmit the RTS that requests a reservation for multiple channels sensed as free by the transmitting device, wherein the multiple channels include a primary channel, wherein the RTS is transmitted on the primary channel, and wherein the one or more channels include the primary channel.