RG-59 does not meet spec. That doesn't mean it won't work, it just means that it is not recommended (in fact, it is recommended AGAINST). Given that, you may find that in your current setup, it works without visible problems. However, should a problem develop in the future, whether it is or is not related to the wiring, resolution of the issue by official service personnel will probably include the replacement of said cable at your expense and may even entail nullification of any warranty on the product due to it being installed in a non-specified manner should the unit need repair. If a Dish installer re-used sub-standard wiring and you DO have a problem, you may have a "case" against them... Document this if you can. The major differences in RG-59/RG-6/RG-11 is shielding and carrying capacity. Over short enough distances there is little difference. RG 6 is "spec", though, and you will want that at a minimum for a good installation.