And HD Radio, whose signals are free, still has something different to offer.
They emanated from low-watt stations whose signals may have carried only a few blocks.
Public Library The messages are transmitted by microwave relay whose signals travel at 186,000 miles per second.
All that remained were the kittens' implants, whose signals were easily obstructed, often faint, and, in any case, soon to go dark.
You'll have the best luck abroad if your phone works on AT&T or T-Mobile, whose signals are compatible with more carriers around the world.
They equipped it with a few microphones on a folding table, and a transmitter whose signals reach up to nine miles.
Since American bombing began on Oct. 7, the Pentagon and American intelligence officials said, Mr. bin Laden has become reluctant to communicate by telephone, whose signals could be scooped up by satellites and other surveillance.
This software uses the Global Positioning System, a network of satellites whose signals provide precise location information, to monitor the position of each sprinkler head as it turns on the pivot.
To control overall volume and change music sources when your sound system is far away indoors, you'll need to use radio-frequency remote controls, whose signals pass through walls and are not swamped by bright sunlight, as infrared remotes' signals are.
Best known for her poem Not Waving But Drowning, about a man who swims too far out to sea and whose signals of distress are misinterpreted for jolly japes, Smith struggled to get her work published in a mid-20th century dominated by the poetic voices of men.
This will be the first "solar maximum" since the widespread adoption of cellular telephones and devices that use the Global Positioning System, both of whose signals may miss their destinations for hours if a solar flare upsets the electrical balance of the earth's atmosphere.
