I am hearing one of the BDL approach/departure frequencies on a portable scanner in the Farmington/Plainville/Bristol area. Since this is too far from BDL, I suspect it’s only the planes I’m hearing and not the airport side of the exchanges. That is, until today, when I heard both sides of the conversations. Either I’m experiencing a band opening or Robertson Airport in Plainville is simulcasting? I doubt simulcasting is the answer however... rebroadcasting on the same frequency would cause interference? Creating heterodyning?