Let's start with calculating the height of the anrenna. You have a right angle triangle formed by the ground, the antenna, and the line of sight to the top of the antenna. From trigonometry:
tangent(42 deg 20 min) = (height of antenna)/236m
So:
height = 236 x tangent(42 deg 20min).
If you know how to find the tangent of 42 degrees 20 minutes you will get your answer. Depending how your calculator is set up you will probably have to convert 42 deg 20 min into degrees only - recall that there are 60 minutes in one degree so 20 minutes = 1/3 degree.
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