A cable channel has fi nally clobbered an established broadcast network.

Well, almost – in a mutant David and Goliath sort of way.

Basic cable’s TNT was watched in more homes by groups of viewers in the age ranges prized by advertisers – adults 18-34, 18-49 and 25-54 – than UPN last month.

With the addition of TNT’s strong finish, the combination of all cable networks drew more viewers as a whole than the broadcast networks, for the first time ever.

TNT’s power came from its coverage of the NBA playoffs and Western Conference finals.

Overall, TNT was watched in about 2.4 million homes, while UPN – which technically is available on more TVs – was seen in about 2.2 million homes.