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 $37\mathrm{.}4$ 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 $40\mathrm{.}7$ with the horizontal. How tall is the antenna?

$H=$

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