How do you calculate the range of a VHF transmitter that is on-board an aircraft? I'm trying to calculate the range of a VHF transmitter on an aircraft output power 50W, frequency 130MHz, and reciever sensitivity of -100dBm.

The calculations I have made give me ridiculously high numbers in the regions of thousands of Kilometres. The formula I used for this is as follows:



Is there perhaps a different formula that I am not aware of?
VHF radio transmissions are primarily limited by line of sight. The formula for this is d = 1.23 * (√h1 + √h2) where h1 and h2 are the altitude s in feet, and d is the max range in miles.