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The brightness of a picture measures how vibrant and impacting the colors are.
Measured in equivalent to the number of candles required to power the image.
Signals can also be delivered by radio from satellites in geosynchronous orbit and received by parabolic dish antennas, which are comparatively large for analog signals, but much smaller for digital.
Television signals were originally transmitted exclusively via land-based transmitters.
(Today's CRT technology allows the manufacture of much wider tubes, and the flat-screen technologies which are becoming steadily more popular have no technical aspect ratio limitations at all.) The BBC's television service used a more squarish 5:4 ratio from 1936 to 3 April 1950, when it too switched to a 4:3 ratio.