What is the farthest distance (NM) the aircraft emits the ADSB signal?

[abcd567]

@taniaachiever

theoretical

@keithma

theoretical

Everyone has his own interpretition of “theoretical”.

My interoretation of theoretical is given below:

@abcd567

THEORETICAL BACKGROUND
Overall Range = Contribution of Receiving Antenna Height to Range + Contribution of Transmitting Antenna Height to Range
= 1.41 x √h1 + 1.41 x √h2 miles,
where
h1 = height of Receiving antenna in feet.
h2 = height of Transmitting antenna in feet.

For plane height 45,000 feet, transmitting antenna height = plane height = 45,000 feet:
Contribution of Transmitting Antenna Height to Range = 1.41 x √45000 miles = 299 miles

CASE A - Receiving antenna height = Mast 10’ Above House + House 15’ Above Ground + Ground 39’ AMSL = 64’ AMSL
Contribution of Receiving Antenna Height to Range = 1.41 x √64 miles = 11.3 miles

CASE B - If Receiving antenna height is increased by 10’, it will be 64’ AMSL+10’=74’ AMSL
Contribution of Receiving Antenna Height to Range = 1.41 x √74 miles = 12.1 miles

Increase in range by increasing antenna height = 12.1 - 11.3 = 0.8 miles

Note: Above calculations assume a level terrain without obstructions such as hills, tall trees, tall buildings etc