Nerdy and geeky. Forgive me.
You suggest using that extra little compartment in your sister's new shortwave radio to store polyhedral die. Why? So we can roll numbers and enter random frequencies.
(It's perfect, too. We almost never get anything above 20 mHz (20,000 kHz), so the d20 is a perfect start, followed by rolling a d10 a couple of times.

)