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- Broadcast TV Distortion and Line of Sight
- In practice, satellite TV is a lot like broadcast
television. They are both forms of wireless systems that deliver television programming to a viewer's TV.
Both broadcast television and satellites used to transmit, send programming by transmitting a radio signal.
Broadcast stations use powerful antennas to transmit radio waves to the surrounding area. Viewers can receive the
signals with a relatively small antenna.
The primary restriction of broadcast television is 'range'. The radio signals used to broadcast television emit
from the broadcast antenna in a straight line.
In order for a television antenna to receive these signals, you have to be in direct 'line of sight' of the transmitting
antenna.
Normal sized buildings and trees are not usually an obstacle. The main problem is the Earth itself as it will reflect
these radio waves.
If the Earth were perfectly flat, you could pick up broadcast television thousands of miles from the source. But
because the planet is curved, it eventually breaks the signal's line of site.
The other problem with broadcast television is that the signal is often distorted even in the viewing area. To
get a perfectly clear signal like you find on cable, you have to be pretty close to the broadcast antenna without
many obstacles in the way.
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