Answer:
14 feet.
Step-by-step explanation:
Use the tangent function:
[tex]tan\alpha = \frac{opposite}{adjacent}[/tex]
a = length of antenna:
[tex]tan\70 = \frac{a}{15}[/tex]
[tex]a = 15tan\70[/tex]
a = 14.09538931 ≈ 14
