Current Attempt in Progress

The drawing shows a person looking at a building on top of which an antenna is mounted. The horizontal distance between the person's eyes and the building is $80\mathrm{.}9m.$ In part a the person is looking at the base of the antenna, and his line of sight makes an angle of $33\mathrm{.}1$ with the horizontal. In part $b$ the person is looking at the top of the antenna, and his line of sight makes an angle of $36\mathrm{.}3$ with the horizontal. How tall is the antenna?

$H=$