Parked alongside his onion fields, Bob Hale can prop open a laptop and read his e-mail or, with just a keystroke, check the moisture of his crops.

As the jack rabbits run by, he can watch CNN online, play a video game or turn his irrigation sprinklers on and off, all from the air-conditioned comfort of his truck.

While cities around the country are battling over plans to offer free or cheap Internet access, this lonely terrain is served by what is billed as the world's largest hotspot, a wireless cloud that stretches over 700 square miles of landscape so dry and desolate it could have been lifted from a cowboy tune.

Similar wireless projects have been stymied in major metropolitan areas by telephone and cable TV companies, which have poured money into legislative bills aimed at discouraging such competition. In Philadelphia, for instance, plans to blanket the entire city with WiFi fueled a battle in the Pennsylvania legislature with Verizon Communications Inc., leading to a law that limits the ability of other municipalities in the state to do the same.

But here among the thistle, large providers such as local phone company Qwest Communications International Inc. see little profit potential. So wireless entrepreneur Fred Ziari drew no resistance for his proposed wireless network, enabling him to quickly build the $5 million cloud at his own expense.

While his service is free to the general public, Ziari is recovering the investment through contracts with more than 30 city and county agencies, as well as big farms such as Hale's, whose onion empire supplies more than two-thirds of the red onions used by the Subway sandwich chain. Morrow County, for instance, pays $180,000 a year for Ziari's services.

Each client, he said, pays not only for yearly access to the cloud but also for specialized applications such as a program that allows local officials to check parking meters remotely.

"Internet service is only a small part of it. The same wireless system is used for surveillance, for intelligent traffic system, for intelligent transportation, for telemedicine and for distance education," said Ziari, who immigrated to the United States from the tiny Iranian town of Shahi along the Caspian Sea.

The system is revolutionizing the way business is conducted in this former frontier town. "Outside the cloud, I can't even get DSL," Hale said. "When I'm inside it, I can take a picture of one of my onions, plug it into my laptop and send it to the Subway guys in San Diego and say, 'Here's a picture of my crop.' "

Even as the number of WiFi hotspots continues to mushroom, with 72,140 now registered globally, only a handful of cities have managed to blanket their entire urban core with wireless Internet access.

Hundreds of cities, from San Francisco to Philadelphia, have announced plans to throw a wireless tarp over their communities, and a few smaller ones such as Chaska, Minn., have succeeded. But only Ziari appears to have pinned down such a large area.

Ziari's wireless network uses both short-range WiFi signals and a version of a related, longer-range technology known as WiMax. While WiFi and WiMax antennas typically connect with the Internet over a physical cable, the transmitters in this network act as wireless relay points, passing the signal along through a technique known as "meshing."

Ziari's company, EZ Wireless LLC, built the towers to match the topography. They are as close as a quarter-of-a-mile apart inside towns such as Hermiston, and as far apart as several miles in the high-desert wilderness.

Asked why other municipalities have had a harder time succeeding, he replies: "Politics." "If we get a go-ahead, we can do a fairly good-sized city in a month or two," Ziari said. "The problem is getting the go-ahead."

"The 'Who's going to get a piece of the action?' has been a big part of the obstacles," said Karen Hanley, senior marketing director of the WiFi Alliance, an industry group based in Austin.

No major players were vying for the action here, making the area's remoteness -- which in the past slowed technological progress -- the key to its advance.

Morrow County, which borders Hermiston and covers 2,000 square miles, still does not have a single traffic light. It has only 11,000 people, a number that would not justify a big investment from a large telecom player, said Casey Beard, the director of emergency management for the county.

Beard was looking for a wireless provider three years ago when Ziari came knocking. The county first considered his proposal at the end of 2002, and by mid-2003, part of the cloud was up.

The high desert around Hermiston also happens to be the home of one of the nation's largest stockpiles of Cold War-era chemical weapons. Under federal guidelines, local government officials were required to devise an emergency evacuation plan for the accidental release of nerve and mustard agents.

Now, emergency responders in the three counties surrounding the Umatilla Chemical Depot are equipped with laptop computers that are WiFi ready. These laptops are set up to detail the size and direction of a potential chemical leak, enabling responders to direct evacuees from the field. Traffic lights and billboards posting evacuation messages can also be controlled remotely over the wireless network.

"We had to find a way to transmit huge amounts of data -- pictures, plume charts. . . . All that data is very complex and it's hard over radio to relay to someone wearing chemical protective gear," Beard said.

And for the Hermiston Police Department, having squad cars equipped with a wireless laptop means officers can work less overtime by being able to file their crime reports from the field.

Though the network was initially set up for the benefit of city and county officials, it is the area's businesses that stand to gain the most, say industry experts.

At the Columbia River Port of Umatilla, one of the largest grain ports in the nation, the wireless network is being used to set up a high-tech security perimeter that will scan the bar codes on incoming cargo.

"It has opened our eyes and minds to possibilities. Now that we're not tied to offices and wires and poles, now what can we do?" said Kim Puzey, the port director.

With wireless broadband Internet access, farmer Bob Hale can send e-mail and photos to customers from an onion field in Hermiston, Ore.Fred Ziari , EZ Wireless president, built the world's largest WiFi hotspot, which covers more than 700 square miles of rural Oregon. His big customers are local governments and farmers.