11’s exclusive

Ch.11’s 10 o’clock newscast will air exclusive interviews tonight and tomorrow with Shyteek Johnson (a.k.a. Nushawn Williams).

Johnson, who is HIV-positive, tells Jonathan Dienst that he had sex with “200-300 women” from New York to Virginia to the Carolinas – after he was infected with HIV.

Dienst conducted the exclusive interview at Clinton Correctional facility in Dannemora.

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He’s history

History Channel examines the 1974 resignation of President Richard Nixon on “As It Happened,” airing Sunday, Aug. 8 – the 25th anniversary of the event.

Included: Interviews with Pat Buchanan, Sam Donaldson and Al Haig. It airs at 10 p.m.

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Clerical cutup

Meet Bob Alper, rabbi … and stand-up comic!

Tonight’s “Extra” (7 p.m. on Ch.4) profiles Alper, a Vermont rabbi who’s been doing stand-up since 1986 and has appeared at clubs including Dangerfield’s here in New York.

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Express Lines:

*Barbara Walters’ “20/20” interview with tennis star Alexandra Stevenson – love child of ex-basketball great Julius Erving – airs tomorrow (10 p.m. on Ch.7).

* Rebecca DeMornay makes her series debut on five episodes of “ER” this season as Dr. Carter’s (Noah Wyle) lover.

*Ch.4’s Pat Battle visits the New Jersey Performing Arts Center in Newark on Sunday (noon).

*Talk back to Lionel – on tonight’s “Snap Judgment” (11 p.m. on Court TV).

*Sheryl Crow on Saturday’s “Hard Rock Live” (midnight on VH1).

*”Reel New York” kicks off its fourth season tomorrow (10 p.m.) on WNET/Ch.13.

*On Sunday’s “Leon Charney Report”: Former U.S. Ambassador to Saudi Arabia, Richard Murphy (4 p.m. on Ch.25).