Just look at some of the programs they air!

Antenna:
Dear John (starring Judd Hirsch)
Becker (starring Ted Danson)
Wings (same universe as Cheers)
Newhart (starring Bob Newhart)

Me:
Taxi (starring Judd Hirsch)
Cheers (starring Ted Danson, same universe as Wings)
The Bob Newhart Show (starring Bob Newhart)