There's a person in green on the first floor of the Goldenrod radio tower, they will give you a 5 question true/false quiz. The prize of the quiz is the radio card for your pokegear.
At the Radio Tower.
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crystal and crystal Edit: Ignoring the above nonsense... there is a comprehensive article on Wikipedia (see related link) detailing the components of a crystal radio - and how they work.
You must obtain a radio card from the receptionist at the radio tower
3 types 1 foxhole radio 2 crystal radio 3 transistor radio
wireless crystal set
You can use it for a crystal radio
its easy turn on the pokegear
You can find it in goldenrod city. There is a quiz on the right of the counter in 1st floor and if you answer them, you get the radio card.
A crystal set was an early Radio or cats whisker receiver simple but popular.
Such a radio was commonly called a Crystal Set .
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