If you are NOT keeping the 5100/5800/5900's, you will not need to change any cabling as the Tech will use DPP Twin LNBF.
If you are keeping the existing receivers, you will need 2 lines to the location where you plan on putting the HD PVR, The Tech will then use an SW44 at the Dish or just inside the home.
If you are keeping the existing receivers, you will need 2 lines to the location where you plan on putting the HD PVR, The Tech will then use an SW44 at the Dish or just inside the home.