The phrase "a vast base" is correct and usable in written English.
It can be used to describe a large foundation or support system, whether literal or metaphorical, such as in business, research, or community contexts.
Example: "The company has built a vast base of loyal customers over the years, which has contributed to its success."
Alternatives: "a large foundation" or "an extensive support system".
The thousands of clubs beyond this elite have very little resources, constituting a vast base of 'have-nots' in football's financial pyramid.
But beneath them are a handful of giant conglomerates that are struggling towards profits, a tier of middling banks with overexposure to risky assets, and a vast base of small banks in deep, deep trouble.
By deploying so many large, economical aircraft from a vast base, open around the clock and halfway between Europe and Asia, Emirates could in effect run a global hub, reducing European airports to a feeder role and impoverishing their associated flag carriers.
The siting here of the country's first new reactor in decades is no doubt in part because of the unique nature of the TVA, a New Deal-era government-controlled corporation with a vast base of municipal utilities and other large customers that buy its power.
The list of such ongoing changes, almost all of them accelerated or initiated by the wars on terror and in Iraq, includes new bits of kit (such as Stryker combat vehicles), a reorganisation of the army into more capable "modular" brigades and a vast base realignment.Under Mr Rumsfeld, America's armed forces have become far more intelligent, agile and capable; then again, so they should have done.
"He has a vast knowledge base and experience.
Furthermore, YouTube already has a vast talent base of gaming superstars.
The government's efforts to boost its domestic industry have included building a vast production base at Huairou, just outside Beijing.
Welfare Inc. has a vast client base of consumers (taxpayers and their dependents), most of whom are also shareholders (voters), a large number of whom receive dividends (benefits).
The "cheep" prices also immediately attracted a vast customer base: recent immigrants who'd arrived in Canada with more hope than money.
It would also allow for the seizure of a vast asset base to be used in future anticrime and antiterrorist activities.
