I am not an expert..... just getting into GCS now with my new WKM...... But I have a few comments to share.
Setting up the software and radio link for me was a bit problematic but it's all resolved now.
Even though the 1st waypoint is free..... you still have to get the WKM serial number upgraded or you will get the message "permission denied".
Also the install disabled my Google Earth program. Un-install and re-install did not fix the problem....
But help from this forum made it possible to get it all working again.
RECOMMENDATIONS: Remove your props or disconnect your motors before testing the software and practice with "simulation mode" for a week or so first.
That's easy for me since it is currently -30 deg C outside....
Keyboard control is a bit awkward at first and might be problematic for some time IMHO.
Connecting a Joystick might be better or a Great Planes Interlink Plus RC controller for a more familiar interface.
I cannot comment on the 2.4Ghz version as I have the 900Mhz for longer range.
For 900Mhz: Range can be 10km or longer in the country but even less than 1 km in city areas.
The aerial antenna is a same as the ground antenna....... heavy/low cost and low performance leaving the door open for upgrading.
I like the idea of swapping it out for a simple 900Mhz bare wire antenna which is much lighter, higher gain, and flexible so that a rough landing will not break off the radio antenna sma connector. I think I have a picture available to show. But it is not the correct antenna length for 910 Mhz (a HAM operator or radio operator can determine the best possible length from some basic antenna calcs).
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The ground antenna can be a 1/2 wavelength or full wavelength omni magnetic roof mount antenna suitable for car or van roof mounting c/w long 50 ohm coax radio cable and connector to the Ground based radio transceiver for much more reliable range. Or you can use a high gain Yagi directional antenna for extra long distance (one direction only).