PowerFlarm Range Analysis for "WX" - 15M Nats Yreka 2014

I contacted Walt, on private email, to praise him for his excellent range.
It appeared to be significant better than mine, with similar make, model and antenna placement.
My different files were showing significant irregularities, side lobes, skewed to one side, etc.
While I dug a bit deeper into this, I noticed in the range analysis image that Walt published above, shows a huge number of contact points. Like 11000 points in his biggest file.
When reviewed my analysis output, I only noticed about 400 points on several 400k flights.
Now, I fly in the "big air" of the Sierras, where contacts with other Flarm equipped gliders can be far and between.
And Walt mentioned that his files were taken during a contest, which, I guess, means a lot of close proximity flying.
So, I decided to concatenate a few of my long IGC file and uploaded the larger file (2000 points) to the analysis tool. Now my pattern look much better, much more homogeneous with good range.
Conclusion: Be careful about drawing conclusions from your Range Analysis output when you only have few contact point ( 500 points).
If in doubt, concatenate some files into a big file and run this big file through the analysis to see if that yield a better result.
Also notice that the analysis reports maximum ranges in the 30-40 km range. Don't know if that is real and if it includes ADS-B pings. If it is Flarm range, that's very good !
3U

3U's comments are correct. I concatenated all the practice and contest days at the Nationals to get 11000 points. So, a large sample at an event with lots of flarms is important. BTW, my flarm antenna is the rear most one on the panel at the highest point in the cockpit. Antennas are the stock dipole that came with the core PF with a 4-5ft length of coax. At one point recently, I considered shortening the cable by resoldering, but decided that my performance was "good enough" and tampering with things seemed inadvisable. How much better would the performance have been by shortening the coax to 2 ft (I need extra length so the canopy cover can easily be removed)?