SOMA Labs have announced the availability of ETHER, a sort of wide open frequency reciever that can listen in to environmental radio waves. Taken as Vlad says int he ETHER product page, from the first radios made which didn't have any tuning capabilities as there just weren't that many stations, it wasn't required.
ETHER will pick up across a wide band and gives you potentially limitless sampling possibilities, though you will need to keep it away from your phone, tablet or even audio recorder - a 3ft lead is recommended for recording.
If that's your bag, ETHER can be bought directly from SOMA Labs here priced at €120 Euros + local VAT and shipping.
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