As to why the US government might want to switch off analogue radio signals (which I wasn't aware they wanted to do), it'd be for the same reason they want to switch off analogue TV signals - digital signals as I understand it require less bandwidth per channel, and they are sent at different frequencies than analogue signals, meaning that the government could then flog off the resulting frequencies for fabulous sums of money, probably to mobile telephone network companies for wireless internet and such.
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Mason: Luckily we at the Agency use use a high-tech piece of software that will let us spot him instantly via high-res satellite images.
Sergeant: You can? That's amazing!
Mason: Yes. We call it 'Google Earth'.
- Five Minute 24 S1 (it lives, honest!)
"Everybody loves pie!"
- Spongebob Squarepants
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