iRobot (the Roomba vacuum cleaner people) have applied for an exemption to 
allow them to send beacon signals in a 6-7 GHz band to fence in their new 
lawnmower.  The band they want to operate in is apparently for indoor only low 
power applications.

The easy solution is to just buy some goats...  the emit very little in the way 
of EMI...  but do emit other,  uhhhh,  signals.

--------------------------
Clearly, you need a better nav system for the robot based on precision 
time of flight measurements from a network of transmitters around the 
property linked to your hydrogen maser.                                         
  
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