this movie was based on real sightings that took place in west virginia, 1966. there was apparently over 100 people saw this creature, between five and seven feet tall, broader than a man, with eyes that were set near the top of the shoulders. its winges were batlike but did not flap when it flew. when it took off from the ground it went straight up like a helicopter.
a police deputy reported a strange interference on his police radio when he approached the sighting area. I never saw the movie though, its prolly cheesy. info from 'strange and unexplained phenomena' by jerome clark and nancy pear.