[RFI] Tip on approach to, or where to start looking for new noise source

[k9mk at flash.net]

Greetings to the group,

   This week I discovered something new on the HF bands.  It does get
stronger on the lower bands.  
   I am not sure what it is (yet).  At first, I thought it was an electric
fence but now I'm not so sure.  
   I'm seeing five on and off pulses.  The pulse duration is one second on
(wideband noisy hash) and then off for three.  
   That repeats five times and then it goes quiet for about 30 seconds, and
then repeats.  

   Has anyone else seen something with this signature?  Thanks in advance.

73, Mike K9MK

PS: My QTH is rural, and the community is mostly cattle ranchers.