A method for transmitting channel feedback data from a receiver to a transmitter, the method comprising: determining channel data for a plurality of orthogonal frequency division multiplexing, OFDM, tones for one or more spatial or space-time streams corresponding to a communication channel; determining a compressed form of the channel data including determining a plurality of angle values (404-1, 404-2, 436, 440, 464-1, 464-2) associated with i) the one or more spatial or space-time streams and ii) one or more OFDM tones of the plurality of OFDM tones; for each of the one or more spatial or space-time streams: i) grouping the plurality of OFDM tones into a plurality of groups of OFDM tones, ii) determining an average signal to noise ratio, avg-SNR (402-1, 402-2, 432-1, 432-2, 462-1, 462-2), by averaging signal to noise ratio, SNR, values corresponding to multiple OFDM tones of the plurality of OFDM tones, and iii) determining, for each group of OFDM tones in the plurality of groups of OFDM tones, a per-tone signal to noise ratio, PT-SNR (434-1, 434-2, 438-1, 438-2, 466-1, 466-2, 468-1, 468-2), associated with one OFDM tone in the group of OFDM tones; generating a feedback report to include at least i) the plurality of angle values associated with the one or more spatial or space-time streams and the one or more OFDM tones, ii) deltas corresponding to the PT-SNRs associated with the one or more spatial or space-time streams and each group of OFDM tones in the plurality of groups of OFDM tones, wherein each delta corresponds to a difference between the respective PT-SNR associated with the one OFDM tone in each group of OFDM tones and the avg-SNR associated with the one or more spatial or space-time streams, and iii) the avg-SNR associated with the one or more spatial or space-time streams; and including the feedback report in a data unit to be transmitted from the receiver to the transmitter. determining channel data for a plurality of orthogonal frequency division multiplexing, OFDM, tones for one or more spatial or space-time streams corresponding to a communication channel; determining a compressed form of the channel data including determining a plurality of angle values (404-1, 404-2, 436, 440, 464-1, 464-2) associated with i) the one or more spatial or space-time streams and ii) one or more OFDM tones of the plurality of OFDM tones; for each of the one or more spatial or space-time streams: i) grouping the plurality of OFDM tones into a plurality of groups of OFDM tones, ii) determining an average signal to noise ratio, avg-SNR (402-1, 402-2, 432-1, 432-2, 462-1, 462-2), by averaging signal to noise ratio, SNR, values corresponding to multiple OFDM tones of the plurality of OFDM tones, and iii) determining, for each group of OFDM tones in the plurality of groups of OFDM tones, a per-tone signal to noise ratio, PT-SNR (434-1, 434-2, 438-1, 438-2, 466-1, 466-2, 468-1, 468-2), associated with one OFDM tone in the group of OFDM tones; i) grouping the plurality of OFDM tones into a plurality of groups of OFDM tones, ii) determining an average signal to noise ratio, avg-SNR (402-1, 402-2, 432-1, 432-2, 462-1, 462-2), by averaging signal to noise ratio, SNR, values corresponding to multiple OFDM tones of the plurality of OFDM tones, and iii) determining, for each group of OFDM tones in the plurality of groups of OFDM tones, a per-tone signal to noise ratio, PT-SNR (434-1, 434-2, 438-1, 438-2, 466-1, 466-2, 468-1, 468-2), associated with one OFDM tone in the group of OFDM tones; generating a feedback report to include at least i) the plurality of angle values associated with the one or more spatial or space-time streams and the one or more OFDM tones, ii) deltas corresponding to the PT-SNRs associated with the one or more spatial or space-time streams and each group of OFDM tones in the plurality of groups of OFDM tones, wherein each delta corresponds to a difference between the respective PT-SNR associated with the one OFDM tone in each group of OFDM tones and the avg-SNR associated with the one or more spatial or space-time streams, and iii) the avg-SNR associated with the one or more spatial or space-time streams; and including the feedback report in a data unit to be transmitted from the receiver to the transmitter.