Please help asap

For this, we'll be using the trig. function tangent. 

Tangent is the opposite over the adjacent (TOA)

x=15*tan(70) = x=18.329

The antenna is 18' to the nearest foot. (Rounding 18.3 to the nearest foot brings us to 18)

EDIT: My answer is incorrect, at least if it's in degrees (which it is).

The correct answer is 41'. 

Definitely shows the importance of changing the mode!

We have

tan (70 ° )  = height  / base ength

tan (70°)  = height  / 15   multiply both sides by 15

15 * tan (70°)  = height  ≈ 41 ft

I think Rarinstraw just forgot to  change the "mode" button on the calculator  from rads to degrees.....a mistake easily made  !!!