Used driverloader from http://www.linuxant.com./driverloader/
used SuSE 9.1 RPM from their site.
and
RealTek driver from
http://www.realtek.com.tw/downloads/
Had to edit .ini file to match vendor/product code of Belkin
version (copied values from bel6020.ini from CDROM that came with
card).
The belkin driver (bel6020.sys on CDROM) did not work.

Same editted .inf file works with ndiswrapper-0.10

(Did not with work with ndiswrapper-0.8 that may have been as
it was fighting with driverloader?)

I tested the F5D6020 ver 3 adapter on a Compaq Presario 1926 Laptop, both with Debian Stable and Unstable. I cannot imagine why it should not run on testing.

Get the latest drivers from realtek here : http://www.realtek.com.tw/downloads/. Compile ndiswrapper >= 1.5 (did NOT work for me with other versions of ndiswrapper).

Doing ndiswrapper -l should give you driver present, but no hardware present. Go into /etc/ndiswrapper/'driver name here' and rename the shortest named .conf file according to lspci output. For me that meant renaming it 1799:6020.5.conf.

Ndiswrapper -l now shows driver AND hardware present.

Type modprobe ndiswrapper and the LED should go on, for me, iwconfig even showed all correct without any manual config. If your router doesn't broadcast ESSID you might have to iwconfig wlan0 ESSID and so on.

This works perfectly, no need for payed services as driverloader etc.

Hope someone benefits from this :)