In some cases the Fox News being SD only may be due to "Other issues" not your equipment (or not)
If your receiver has not been used for a long period you need to get Dish to update it.
As for the antenna... It don't take much in the way of trees to block the signal.
And I've seen 'em fail to lock on due to Radio Interference as well,.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times