How can there be so few efficient stations?

[cutty]

Welcome aboard!  
Upgraded your forum status to "participant" ... you now have access to internal "participants only" boards.

For response to your query, see this post:
https://forum.blitzortung.org/showthread...6#pid25976
note the 'key phrase':
"... efficiency" and "Effectivity" are totally deprecated terms at this stage of network growth and development."

other examples re: lightningmaps.org here
https://forum.blitzortung.org/showthread...9#pid27179
https://forum.blitzortung.org/showthread...8#pid27258
 ...etc., etc.

Mike