arxaw, KNWA's programming note about HD installation might have been for KNWA-DT on channel 50. I can't get KNWA-DT here in Greenwood, but some in Fort Smith, Alma, etc. might. I haven't noticed any changes to KFTA-DT.
nj829, KFTA-DT, channel 27 (ex-KPOM-DT) has been on the air for at least a couple of years, mirroring KNWA's programming, but not in high definition. I don't think they're at full power yet. I do get a decent signal, usually 80 percent or better, with a signal strength comparable to KHOG-DT, channel 15, in Fayetteville 20 miles further north, if that helps. KFTA's antenna is located about 33 miles north of me and 50 miles due south of your zip code.