The 1 the yanks left on the moon? Only 3 months ago i bought a CPC 925 XCT telescope for over £2,000, been scanning the moon every night since & cannot see the flag. Have i been sold a dud telescope or did the yanks never actually go there?
A flag on the moon is too small to be seen by even the largest Earth-based telescope. You'll need to splash the cash for a Lunar Reconnaissance Orbiter.