Translators far away?

[Don]

Maybe some of the technical people can answer this?

This is a translator for 1570AM in Methuen

https://radio-locator.com/cgi-bin/patg?id=W287CW-FX

Looks like it barely reaches the city of license.....Methuen (right next to 
Haverhill).

Looks like the translator serves a different geo-population that the AM it 
is intended to help.

How is this OK?

Thanks for your thoughts...

D