"has a broad network" is correct and usable in written English.
You can use it to describe a situation where a person or organization has many relationships or contacts in a wide scope or range. For example: "He has a broad network of colleagues in the industry, which allows him to gain insight into the latest news and trends."
The Obama campaign, which raised $1 million a day after his Iowa victory, says it has a broad network of smaller donors who might be able to write additional checks.
Although the group has been outlawed by the state, it has a broad network of social services around the country, which the government tolerates, and an ability to bring armies of supporters out — if it chooses to.
IIE-SRF referred me to the Scholars at Risk (SAR) Network, which is also based in New York City but has a broad network in Europe.
immatics has a broad network of contacts in the pharmaceutical industry.
EBillMe offers a similar service and has a broader network, including 7-Eleven, Wal-Mart and CVS locations in the U.S. The big difference: EBillMe charges consumers $5 per transaction.
He had a broad network of collaborators".
Lutherans have a broad network of churches that can provide shelter, and specialize in long-term relief work.
If the Russians were nervous about sensitive military research getting into Western hands, as many Russian analysts contend, cracking down on someone like Mr. Pope, who had visited Russia more than two dozen times and had a broad network of contacts, would send a chilling signal.
Having worked as a beer buyer for a liquor store and a waiter at a top-tier Dupont Circle restaurant, Obelisk, before plunging into the distilling business, Mr. Uselton had a broad network of contacts in the restaurant and beverage business in the area.
"Any political clients are still going to reflect our values," Joe Rospars, a founding partner, told Fast Company, affirming the company's ideological commitment, before adding: What we really liked about WPP was that they have a broad network of companies in spaces that are complementary to where we work — whether it's in advertising, research, or general consulting.
"This is not the type of business with lots of people involved because it involves trust, but we have a broad network and a company that can help us in peak times — but that's rare".
