Despite the beautiful landscape and the shining dishes of the millimeter-wave radio telescope at Hat Creek, the scene pictured is rather unremarkable a drilling rig in a sage-covered field. It could be drilling a new water-well for the local rancher or an exploratory oil well for a transnational company. In fact, the rigs rhythmic pounding and the rising plume of dust signify the first moments of construction of the Allen Telescope Array.

The Allen Telescope Array will be the "new kid in town" at the Hat Creek Radio Observatory in northern California, where the University of California currently operates an array called BIMA (Berkeley-Illinois-Maryland Array) that observes at millimeter-wavelengths. Because BIMA will perform better at a higher elevation site, it will migrate south in the next few years to mate with an array operated by Caltech, leaving the Allen Telescope Array alone in the lava and sage-covered valley just north of Mount Lassen National Park.

The development of the Allen Telescope Array is marked by many innovations crafted with the express purpose of building a world-class state-of-the-art astronomical facility at a fraction of the price of existing radio telescopes. Some examples of these innovations are:

• the gangly offset Gregorian optics;
• the ultra-precise 20-foot primary antenna surface, made by a novel process that rapidly forms a single flat piece of aluminum into the required shape;
• an intriguing wide-band microwave "feed" and receiver, that collects all of the energy transported via radio waves from the far reaches of the universe so they may be amplified and examined by scientists;
• miniature refrigerators (housed inside the feed itself) that use sound waves to chill down the amplifiers to -315 F, preventing the thermal rattling of the electrons in the wires from adding its local roar to the quiet whisper of the received distant signal;
• analog fiber-optic links that allow us to cheaply bring back the entire band of frequencies at which we can operate for processing, allowing different astronomers to examine the universe at separate frequencies simultaneously.

Although the physical structure of the Allen Telescope Array is dominated by the "metal in the meadow" described above, what truly makes it distinctive is that it will be one of the first digital radio telescopes to allow astronomers to look at completely different frequencies at the same time, and to observe completely different parts of the sky concurrently. This means that the Allen Telescope Array is not just one instrument, but in effect, many.

The capability allowed by this flexibility makes the partnership between the SETI Institute and the Radio Astronomy Lab particularly beneficial; while the RAL embarks on its ambitious observing programs of astronomical sources, the SETI Institute will concurrently use the full extent of the array to search our galactic neighborhood for that quiet tone with its thunderous implications.

The Allen Telescope Array allows everyone to not only get their cake and eat it too, but also to pick out their favorite flavors and toppings as well. In fact, each person gets the whole cake and not just a small, unsatisfying sliver. And finding the distant whine from a galactic neighbor would certainly be a very nice cherry on top.