Watch the movies and imagine an array of nanotube front-ends feeding a SDR. Talk about tiny.
Quoting:
"We constructed a fully functional, fully integrated
radio receiver, orders-of-magnitude smaller than any previous
radio, from a single carbon nanotube. The single nanotube
serves, at once, as all major components of a radio: antenna,
tuner, amplifier, and demodulator. Moreover, the antenna and
tuner are implemented in a radically different manner than
traditional radios, receiving signals via high frequency
mechanical vibrations of the nanotube rather than
through traditional electrical means. We have already used
the nanotube radio to receive and play music from FM radio
transmissions such as Layla by Eric Clapton (Derek and
the Dominos) and the Beach Boy's Good Vibrations. The
nanotube radio's extremely small size could enable radical new
applications such as radio controlled devices small enough to
exist in the human bloodstream, or simply smaller, cheaper,
and more efficient wireless devices such as cellular
phones."