The fund invests at least 80% of its assets in debt securities whose interest is, in the opinion of bond counsel for the issuer at the time of issuance, exempt from federal income tax ("Municipal Bonds"). It may invest, without limitation, in higher rated Municipal Bonds. The fund may invest up to 30% of its assets in "private activity" bonds whose interest is a tax-preference item for purposes of the federal alternative minimum tax ("AMT").