For the US, the new ATSC 3.0 standard talks about a "return path" where it sounds like your non-cable, non-Internet broadcast TV will be somehow sending data back to TV stations.
For some reason, this reminds me of a skit in Kentucky Fried Movie called "Eyewitness News".
The skit was of a couple watching television while the news was on. The couple starts making out, and it's clear that the news anchor can see out of the television. The news crew gathers around viewing out of the television into the couple's living room...
The piece that talks to the broadcast towers is called the "Dedicated Return Channel" or DRC. It doesn't seem to have anything do with an existing consumer broadband connection.
> Dedicated Return Channel (DRC) supports interactive services in ATSC 3.0 without dependence
on other non-ATSC 3.0 network infrastructure. In ATSC 3.0, downlink broadcast channel and
Dedicated Return Channel for interactive services use different RF frequencies (i.e. Frequency
Division Duplexing). The PHY layer and Media Access Control (MAC) layer for DRC are defined
in this specification.
It uses a modified OFDMA which I think is similar to 4G LTE
> The DRC uplink transmitter uses Single Carrier Frequency Division Multiple Access (SCFDMA) as the multiple access scheme. SC-FDMA is similar to Orthogonal Frequency Division
Multiple Access (OFDMA) except for a Discrete Fourier Transform (DFT) operation performed
before the Inverse Fast Fourier Transform (IFFT).
