Radio tuner app for iphone 6?

I workout at the gym often and see that the tv's have audio tuned in to different radio channels, though I can't find any (free) radio tuner apps that let me manually program to those channels.

Any apps anybody knows about for iPhone 6 that does radio frequencies?

They all are using their cellular data plans. The iphone does not have a tuner circuit, and therefore, can't pick up FM radio signals, only internet data. The televisions are probably playing closed circuit TV, videos, Cable TV or Satellite (Dish + SiriusXM).

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