Dish/Receiver Maximum Distance

I feel sure that has been asked before but was not able to find on a search. I have upgraded to HD and the install is planned for early next week. I understand that I can expect the Slimline 5 LNB Dish an HR21 Receiver. My question is what is the maximum distance allowed from the Dish to the Receiver without amplification. The Dish install manual mentions runs that "far exceed 100 feet (150 feet or more)" but did not specify an upper limit the installers may use.

The deal is that I have lots of tree close to my house but an unobstructed view from the lower part of my lot which would probably be about 150 feet after burial and routing to the receivers.

Any help here would be greatly appreciated.

I guess I was looking for the maximum distance that an installer would run under the free 5 LNB dish install provided by DirecTV. I assume they will be using RG6. I have found information indicating that the distance is anywhere from 100 to 175 feet without a significant signal loss to require amplification. If so, will DirecTV run that much cable (I need four outputs)?

Thanks for the comments. This will be very helpful when the installer shows up.

The reason for needing about 125 feet of cable is as follows. I pre-scouted a couple of locations based on pointing information and my tree situation. The only options I could find was placing the dish close to but in front of my house and shooting over the house. This will barely clear the trees in the middle of the lot behind my house and I am not sure that it will meet the 20 degree width needed to catch all the satellites. As a side note, my wife does not like the idea of the dish in front of the house. My other option was the lower part of my lot where the trees end and there is a clear line-of-sight with no present or future obstructions. This seemed to make the best sense to me.

The tip on cable burial is very good. I was planning to do that myself as my lot is natural (no grass) with only mulch as a ground cover. I was also planning to pre-drill the holes needed from under my house to access my two DVR's. I have also worked out a potential entrance point and grounding location (cold water metal pipe grounded to my ground stake and system electrical service).

Can anyone think of anything else that will make this go smooth and trouble free?