not totally true. look at zipcode 21643, and zipcode 21801.
both are salisbury md dma
however 21643 could barely pickup baltimore locals prior to salisbury going live.
they got the baltimore locals.
they are still listed as having them on d* website
and they did/do get them.
or you could live in a town that has 3 different sets of locals available. Dead serious. Pull up 56001 Mankato, MN. The city is in 3 counties (Nicollet, Blue Earth, Le Seuer) and has one TV station (well 2 now....KEYC CBS and KEYC-DT2 Fox)
Le Seuer is in the Minneapolis DMA (90 miles away) and gets Minneapolis locals only
Nicollet is also in the Minneapolis DMA but KEYC studios are in that county (North Mankato) so customers there get KEYC as SV
Blue Earth is KEYC, the other 3 missing networks from Minneapolis, DC CW and National PBS
Dish carries Mankato Fox, Directv gives them Minneapolis Fox (D* has had Mankato locals up before KEYC launched Fox there...I bet in the next retrans deal they drop Mpls fox for KEYC Fox there)