The easy-to-remember way:
#!/usr/bin/perl -w
use strict;
use CGI qw/:standard/;
print redirect('http://www.redantigua.com');

More efficient, not loading the CGI module:
#!/usr/bin/perl -w
use strict;
print 'Status: 302 Moved', "\r\n", 'Location: http://www.redantigua.com', "\r\n\r\n";