That's not how it works snake. The entire country does not see the same local network feed. The local networks are different in every market across the US with DirecTV. Let's take CBS for example since that's the issue right now.
In my area, Starkville, the local CBS feed is from WCBI. In Jackson, the CBS feed comes form WJTV. WCBI and WJTV boradcast their signals over the air (antenna) in HD. DirecTV gets their feed from WCBI and WJTV by physically locating a retransmitter satelitte uplink at the WCBI/WJTV transmitter. This uplink equipment transmits the signal from WCBI/WJTV up to the Satellite then out to DirecTV customers in the appropriate area. That signal that's uplinked from WCBI/WJTV is dependent on what type uplink equipment DirecTV puts on the WCBI/WJTV site. DirecTV put an HD uplink at WJTV in Jackson but only put a SD uplink at WCBI. So, WJTV gets their feed sent up to DirecTV in HD while WCBI only gets theirs send up in SD. I've spoken with the station engineer for WTVA and WCBI. Both have offered DirecTV the space for the HD equipment but DirecTV has not accepted.
DirecTV does this for bandwidth issues. It takes up more satellite bandwidth to transmit and HD signal than a SD signal. So, they do the bigger markets in HD first and pick up the others as their bandwidth increases with more satellites.
Again, I ask where you live? The ONLY Mississippi CBS station that DirecTV ACTUALLY broadcasts in HD is in Jackson.
Now, I said that my feed looked like it was broadcast in the 50's, that was kind of an exaggeration. I said that based on today's HD technology. An HD feed looks very clear and SHARP. The feed I was watching on DirecTV was a very blurry SD feed. Plus, I was watching it on a projector projecting onto a 150" screen so EVERY imperfection was expanded. I changed to my antenna and it was HD clear.