Filed by Federated Municipal High Yield Advantage Fund, Inc.

Pursuant to Rule 14a-6 of the Securities Act of 1934

Subject Company:  Federated Municipal High Yield Advantage Fund, Inc.
Commission File No. 811-4533







Dear Shareholder:

As discussed in the Proxy Statement that was previously mailed to you, the Board
of  Directors  of Federated  Municipal  High Yield  Advantage  Fund,  Inc.  (the
"Fund"),  a  Maryland  corporation,  approved  a  proposal  to  reorganize  (the
"Reorganization")  the Fund into Federated  Municipal High Yield  Advantage Fund
(the  "Reorganized  Fund"), a series of Federated  Municipal  Income  Securities
Trust,   a   Massachusetts   business   trust.   The  purpose  of  the  proposed
Reorganization  is  to  convert  the  Fund  from  a  Maryland  corporation  to a
Massachusetts  business  trust,  which  will  result  in  tax  savings  for  the
Reorganized Fund.

This proposal has been submitted to Fund  shareholders  for approval,  and Proxy
Statements  were mailed on or about September 13, 2006 to Fund  shareholders.  A
shareholder  meeting  of the  Fund  to vote on the  proposed  Reorganization  is
scheduled  to occur on  October  19,  2006.  If Fund  shareholders  approve  the
Reorganization,  the number of shares you own and the value of your account will
not change.  We urge you to read the Proxy  Statement  and cast your vote on the
proposal.

According to our records,  you currently have share  certificate(s)  of the Fund
outstanding.  We are asking you to surrender your share  certificate(s)  now, in
the event the Reorganization  occurs. This is important because the Fund stopped
issuing, and the Reorganized Fund does not issue, share certificates.  Therefore
if you were to redeem or exchange shares represented by certificates  previously
issued  by the Fund,  you would  need to  return  the  certificate(s)  with your
written  request for your redemption or exchange.  Because the Reorganized  Fund
does not issue share certificates, if the Reorganization is approved, all shares
of the Reorganized Fund will be held in "book entry" (uncertificated) form. This
allows  redemptions  and  exchanges to be processed  quickly - without the delay
involved when a certificate  has to be returned.  Your account  statements  will
reflect your complete  holdings in the Fund prior to the  Reorganization  and in
the Reorganized Fund if the Reorganization is approved.

For your protection,  send your  certificate(s) by registered or certified mail,
but do not endorse  them.  Even  though  this is  currently  the  procedure  for
handling certificated shares, our experience has shown that it is more efficient
for you to deal with your certificates before a reorganization  takes place. For
your  protection,  we  recommend  that  you  send the  unsigned  certificate  by
registered or certified mail to:

      The Federated Funds
      30 Dan Road
      Canton, MA  02021

Please call 1-800-245-4700 if you can't locate the certificate.

Thank you for your cooperation.

Sincerely,



/s/J. Christopher Donahue
J. Christopher Donahue
President
Federated Municipal High Yield Advantage Fund, Inc.

Federated Municipal High Yield Advantage Fund, Inc. (ICA No. 811-4533) has filed
a  proxy  statement  and  other  relevant   documents   concerning  the  planned
transactions  with the United States  Securities  and Exchange  Commission  (the
"SEC").  INVESTORS  ARE URGED TO READ THE PROXY  STATEMENT  AND OTHER  DOCUMENTS
FILED WITH THE SEC IN CONNECTION WITH THE PLANNED  TRANSACTION,  OR INCORPORATED
BY REFERENCE  INTO THE PROXY  STATEMENT,  BECAUSE  THEY WILL  CONTAIN  IMPORTANT
INFORMATION ABOUT THE TRANSACTION AND RELATED MATTERS. Investors will be able to
obtain these  documents,  and  information  regarding  the  participants  in the
planned  transaction,  free of  charge  at the SEC Web  site  (www.sec.gov).  In
addition, documents filed with the SEC by Federated are available free of charge
at 1-800-341-7400.