Tv reception at sea is dependent on line of sight.
When the horizon or curvature of the earth comes between the TV
Transmitter and the Ship's receiving antenna, the signal is
blocked
First select feet or meteres and then input the antenna heights above
sea level.
The predicted reception range will show in miles or KM as you select.
Note that more powerful TV transmitters can extend this range by about
20 pct due to scatter effect!
Feet Metres
Height of Shore
Transmitter Antenna (ASL)
Height of Ship's TV
Antenna (ASL)