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It is important that the listening method is also recorded. Categories include;
AM and FM broadcasts
DAB+ including digital only broadcasts and simulcasts of AM/FM programming.
DRM, if it becomes the digital radio for country areas for digital only and AM/FM simulcasts.
Smart Speakers
The use of Apps on mobile phones/tablet
On line using a computer
On TV's radio mode (including DVB-T used on the ground TV transmitters and Viewer Accessed Satellite Television)
This is important;
1. because various statistics talk of % increases of that technology not a proportion of the total listening which distorts the market.
2. All of the above modes are susceptible to electricity failures in either the NBN or mobile phone networks where the battery backup is around 3 hours and decreasing as the huge number of batteries decline in capacity.
3. All but the lowest power transmitters are generator backed up, and DAB+, FM, AM, DRM in increasing order all cover much larger areas than the mobile phone network, and the receivers can be mobile in cars or portable including hand held. In addition radios have their own battery which is not required to call for help.