The high-end devices have a fully symmetrical layout for operation with analogue audio sources, thus ensuring absolutely symmetrical signal transmission from the source to the headphones.

ENGADGET: Sennheiser unveils HDVA 600 analog headphone amp, asks for $1,600

The station famously has a tremendous transmission signal and audience reach that spans from sea to shining sea.

FORBES: The Impact Of Location On Brand Loyalty: The Cubs, Cardinals And Rays

In the science fiction flick The Signal, a mysterious transmission makes the inhabitants of a city insane.

FORBES: Magazine Article

The RT-N12HP utilizes a custom hardware architecture that augments wireless transmission and signal quality with detachable 9dBi high-gain antennas and a discrete signal power amplifier.

ENGADGET: ASUS unveils RT-N12HP WiFi router with extra-long antennas: compensating for anything?

"Even though the animals were on different continents, with the resulting noisy transmission and signal delays, they could still communicate, " said Miguel Pais-Vieira, another member of the team.

CNN: Do telepathic rats advent biologic computers?

With distributed transmission, the signal is delivered to each of its transmitters via fixed channels (land-based delivery).

ENGADGET: blogger-avatar

The captured data is then encoded with GPS info and immediately sent to a call center or trusted friend, or stored for future transmission if a signal is not readily available (since you need to reenter a coverage area at some point for this device to be effective, we can safely rule out T-Mobile as a potential carrier).

ENGADGET: Nokia's cellphone for kidnap victims

Perth also reduced the power of the transmission to make it more like the sort of faint X-band signal the craft would expect to hear at Mars.

BBC: Signal picked up from Russia's stranded Mars probe

By changing the frequency of a radio transmission many times a second, causing it to leap around in an apparently random fashion, a radio signal could be made almost impossible to intercept.

ECONOMIST: Player-piano pioneer