Brian,
My admittedly distant memories from a misspent youth as a radio ham are that the word tuner is just not used in that way in the context of radio communication. The building blocks of a typical receiver (RX) are a front end (low noise amplifier), various mixer/local oscillator stages, a demodulator, an amplifier and a speaker of some sort. In that context a tuner would be more likely to be something you would have between your transmitter and your aerial/antenna to match the two (SWR etc.), such as a balun.
So tuner ≠ receiver, so Michael must be referring to the HiFi or FM use, in which context tuner + amplifier = receiver. I think Michael is saying we should call the FM thingy on the roof an aerial rather than an antenna.