You will need a VCP driver for use with the Alaris DF-0047A Antenna. This driver can be downloaded from the following
 location on the FDTI Chip Web site:  http://www.ftdichip.com/Drivers/VCP.htm

In the Currently Supported VCP Drivers table on that Web page, select setup executable in the Comments column of the
 Windows operating system row to download.

For more information about the Alaris DF-A0047 antenna, visit the Alaris product page at
 http://www.alarisantennas.com/index.php?q=catalogue|productinfo,61,Handheld-Direction-Finding-Antenna