Observations are reported of an undocumented HF scattering mode detected by the Kodiak SuperDARN radar during an O-mode heating experiment recently conducted at the HAARP facility near Gakona, AK. The main features of these observations include enhancements to the Kodiak radar spectrum at frequencies equal to the radar plus the heater frequencies (fr + fH) as well as somewhat weaker enhancements at (fr + fH) ¿ 85 and (fr + fH) ¿ 108 kHz. Observations were recorded for ~20 minutes and enhanced spectra from the heated volume above HAARP were consistently observed by the Kodiak radar during times when the HAARP heater was transmitting. We suggest that the spectral enhancements indicate the presence of perpendicularly propagating upper hybrid (UH) waves which are believed to exist near the UH resonance layer.