I would think the directv's first opportunity to ground the system is when they enter the garage (non-heated garage) 52 feet from the pole.
Not to say it cant happen with you install but i'll let you in on what i was told on my install..
The first installer left the job and never grounded the system at all... i called up Directv and questioned it and they sent out another installer.
The second guy came , looked at it and left.... so i got Ellen's office involved in my questioning it... They sent out there "supervising lead tech" the very next day.
This come comes out, goes over it and says "looks good to me"... so i questioned it with him. BTW this guy also stated that internet forums such as DBSTalk are filled with people that really don't know what there doing:bang... i disagree...
Then he preceded to claim that it is directv's policy that if the dish is more than 15ft from the point where the electric service is grounded it is "OK" to let the dish ungrounded.
Personally driving around town i have seen people with pole mounts that have installed a grounding rod right next to where the dish is located but i have no clue if that was done by Directv installer or on there own or if it would even pass QC to do that...
Just my experiance with it.. HIH