Just to clarify. A neckloop is like a headset. You put it around your neck, turn your telecoils on, and plug it into an audio device such as a computer, cell phone, ipad, portable radio, etc. It's a mini loop system that will bring sound from that device directly to your telecoil equipped hearing aid. BlueTooth is similar, but it will not work with a large assistive listening system.

Those systems are installed in theaters, performing arts centers, meeting rooms, conference centers, museums, etc. I mentioned worship centers because many of them have assistive tech even though they are not mandated to have it by the ADA. The public venues are.

Philadelphia has a strong HLAA Presence, so it's not surprising you saw a loop system there. I'm sure there are many installations. When people advocate and educate good things happen. 🙂