Another try at dimensions of the plane. Used the H6K as well as some structures nearby to size it up.
Most likely set of dimensions 24.4 wingspan and 18.4 length.
Dish is a bit harder to measure as its color blends more with the background. Still, i'd wager it's around 7 m in diameter.
For comparison, E-2C figures:
length 17.6 m
wingspan 24.5 m
dish diameter 7.3 m