Searching the Instrument Driver Network, unfortunately it does not look like this instrument has a posted driver. You could modify an existing LabVIEW driver for a similar instrument. Here is a link to the Anritsu website that has a list of their available instrument drivers for their hardware. Otherwise, you should be able to use VISA to communicate with this instrument, as long as this instrument can communicate using a protocol VISA supports (such as TCP/IP, GPIB, serial, etc).
If developing your own instrument driver is not an option, you can contact manufacturer and see if they will create an instrument driver for you. Your other option is to work with a company, such as an Alliance member, that will write the instrument driver for you. I'm sorry I don't have an easier answer for you.