"The dial no longer needs tuning, however, descending underground in the city to any one of its carparks cuts the signal. No hiss of noise. No stutter. The gush of advertising punctuated by some other vagrant from the eighties reliving the moment just stops. Wheels roll. Wet concrete’s lower frequencies rumble through the suspension. It’s a much less forgiving carrier, the digital radio, this medium allows only two positions. Vibrating and still. In spite of this stark modal difference from previous incarnations, the antennae still decrypt from the airwaves a signal. The wires and circuit boards act as the intervening substance making the intangible, felt."