Here is a capture of red sprites exhibiting forward scatter reflections at 67.250 MHz CW. The transmitter source is analog channel 4 television broadcasting from Mexico. Note there are two distinct sprite events in rapid succession making a "ping-ping" sound in audio. On the second audio channel is direct reception at ELF (extremely low frequency) wherein you can hear the initiating lightning strokes and residual crackle.
Thomas Ashcraft : New Mexico More various observations at heliotown.com