Who is broadcasting at 87.7

[John]

I've heard a hip-hop format with a lot of urban chatter at 87.9
(although sometimes it is clearer at 87.7).
I've heard them say 'broadcasting from Yonkers to Boston',
which would make it a pretty powerful pirate.
They also, apparently, sell ad time.  I've heard a spot (forget
the product though).
I thought it might be 'skip' at first but they called themselves
Radio 87.9.
(John Lee)