Have ever wondered the height of antennas , tree , buildings and power poles over a fence with big guard dog 
. This how you get height without cross over the fence.
⁜⁜⁜⁜⁜⁜⁜⁜ The Antenna ⁜⁜⁜⁜⁜⁜⁜⁜⁜
⁜⁜⁜⁜⁜⁜⁜ simple Formula ⁜⁜⁜⁜⁜⁜⁜⁜
⁜⁜⁜⁜⁜⁜⁜⁜ Tangent table ⁜⁜⁜⁜⁜⁜⁜⁜⁜
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⁜⁜⁜⁜⁜⁜⁜ CAM SEXTANT ⁜⁜⁜⁜⁜⁜⁜⁜⁜
Using a free app at the store call CAM SEXTANT.
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Just point to the top antenna and take angle. Then back up 15 to 20 feet { I use my car it us 17 long and everyone thinķ you are only taking photo } (note the distance is need for formula).
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Using the Tangent table get numbers
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Now you have everything need to find the height two Tangent numbers and length between the two reeds
⁜⁜⁜⁜⁜⁜⁜ Using the Formula ⁜⁜⁜⁜⁜⁜⁜
The known information is
D = 17
𝛂 = 25 = Tangent is 0.4662
𝛃) = 45 = Tangent is 1.0000
Cellphone is 5 feet off ground
Top line 17 X 0.4663 X 1.0000 = 7.9271
Bottom line 1.0000 - 0.4663 = 0.5337
Now take 7.9271 ÷ 0.5337 = 14.8531
Now add the height of cellphone off ground we will say 5 feet each person is different
The real height is 14.9 + 5 = 19.9 feet
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Accurate is dependent on operation easy is ±2 feet with great care ±0.1 inch
⁜⁜⁜⁜⁜⁜⁜⁜⁜⁜ App ⁜⁜⁜⁜⁜⁜⁜⁜⁜⁜⁜⁜
App found on Google store Free and Apple store price unkown.
Dave