I have been contemplating the implications of the blue shift observed in the Wow! signal equations, as well as the nature of its source.
Background: this article explains the Wow! signal equations:

So, why would the Wow! signal have been blue-shifted?
Hydrogen-Fusion Drive

1: The signal source is the emission of a hydrogen fusion drive for object deceleration. Hydrogen fusion drives currently exceed human technology. The signal source “object” had a speed similar to that of Apollo capsules during their entry into the Earth’s atmosphere.
I am not categorically suggesting that this “object” entered the atmosphere; rather, I am stating that the speed of the signal source was comparable to that of the Apollo capsules. However, it cannot be excluded that the Wow! signal source (the object the hypothetical fusion drive was attached to) entered the Earth’s atmosphere and landed.

Hydrogen Maser

2: The signal source was a hydrogen maser that was approaching the Earth and emitted a signal. The reason for this is unknown. Was extraterrestrial intelligence attempting to attract attention? If so, then why was the signal not repeated?
Image: Space hydrogen maser, ESA
Related Sightings?
3: As a consequence, were there unusual UFO sightings on or after August 18, 1977? Or did other extraordinary events occur after 18. August 1977?
Image: The Petrozavodsk phenomenon, aka the Jellyfish UFO, September 1977.

A. Two days later, on August 20, 1977, NASA successfully launched the first Voyager spacecraft. It carried a golden record with sounds and images of Earth, intended as a message to any intelligent life form that might encounter it.

B. On October 6, 1977, the United Nations Assembly debated the existence of UFOs. The researchers presented a proposal to investigate the phenomenon.

C. On November 26, 1977, a strange transmission interrupted a news program on ITN, a British television channel. A distorted voice claiming to be Vrillon, a representative of the Ashtar Galactic Command, replaced the sound.

A, B and C are just some examples that immediately come to mind, when thinking about 1977—they are not inclusive.