United States Information Agency Appropriations Authorization Act - Authorizes the appropriation of funds for the United States Information Agency for fiscal year 1976, to carry out international informational activities and programs under specified Federal Acts. Provides $257,692,000 for salaries and expenses; $6,187,000 for "Special International Exhibitions"; $10,135,000 for acquisition and construction of radio facilities; and such additional amounts as necessary for increases in salary and employee benefits. Authorizes necessary appropriations for the USIA for fiscal year 1977 to carry out the above provisions.