jones, page-40

This was from 2010, but gives an idea of numbers

"Jones' 2GB breakfast show dipped 2.8 percentage points in the latest survey - about 16,000 listeners."

So that means his audience is about 580,000.

He has about 17%, so the total audience is 3.3 million.

The voting population is about 11,000,000.

So Alan Jones' audience is about 5.5% of all voters.

Quite a few voters, yes, but tiny compared with TV audiences.