You are far better off have no ground than an improper ground.
If you drive a ground rod, thus establishing a bond to earth via your satellite system, power surges may find an easier path to ground via your satellite system. If you use surge suppressors, you are even more in trouble. Surge suppressors do not stop anything. They only route power to ground. Since your satellite receiver has a grounded plug it is now part of the grounding system in your home. A power surge entering a surge protector is routed to the ground side of your electrical system. If you have a grounded satellite system that is NOT bonded to the house electrical ground, the power surge has two options as to where it goes. It can dissipate through the house wiring to the house ground, or it can move down your satellites receivers ground plug to the receiver, and out the coax shield to reach the NEW ground rod you installed. If the new ground rod is properly bonded to the home ground, both ground rods are neutral in potential. The currant will flow through the path of less resistance, which is the 14 awg or larger home wiring. Actually the currant will flow down both paths, but mostly the home wiring.
Your installer is supposed to ground properly, but there are many times it is just not possible. Your installer has assumed responsibility for the dangers that may or
may not exist by not grounding. If he is an independent contractor, then it is his call. If he works for a larger company, then he may get in trouble if they QC the job. ALL installers are required to ground PERIOD. Both DirecTV and DISH do not want a consumer suing them because something went wrong and the lack of ground was found to be at fault. Mostly it is just a bunch of lawyers covering their clients a$$es. I most cases, the lack of ground is over looked. They simply fine the installer and move on.
The NEC is out dated with regards to satellite grounding, but it is what we have to work with.
So what do you do?
You do not drive a ground rod unless you can bond that rod to the home ground with a #6 wire.
Technically your receive is grounded via the power cord, although not to NEC specs. Unless you are in a heavily lightning area, you better off leaving it alone, than grounding improperly.
If you are really worried about power surges, I suggest a really good surge suppressor with satellite rated coax loop through ports and telephone protection. Do not forget about the telephone cord. Do not buy some over priced Monster unit.
That all said, some states have different rules than the NEC. The NEC is only a recommendation, not a law. Your local regulation may vary.
Here is the best satellite surge suppressor.
http://www.panamax.com/products.cfm?group=2&sec=detail&id=249&ly=v
One thing to remember, the cable from the dish to the receiver carries very high frequencies. Not all surge units with coax jacks will work well with satellite.