FM radio signals can travel for miles around if nothing is in the way, but get almost stopped by a brick wall on site. I used to work in a shopping centre, I struggled to hear people in certain areas of the site, but could hear the place from 25 miles away on the Isle of Arran. One of the worst blind spots was right under the antenna, which was on the roof, while transmitting on the shopping centre floor.
32.718Hz is rather low but using this band seems foolhardy. Just think what you could do with a standard radio mic pack and an iPod. You could leave the deviation set, and simply under drive it, creating your audio file with the correct sub-audible tone generated in a DAW. The fun of strange announcements, and a mobile phone to record the chaos - and in a totally unlicensed and uncontrolled band, totally legal too! Sending 500 people to the wrong platform and then back again would look great on TV. Or is this just rather childish?
The pilot tone is not like a tone burst, it is a frequency that the receiver looks for to confirm the transmitter is working. If it does not hear the right tone on the right frequency the receiver goes off line. So yes it's KHz & not Hz & it's common on professional audio equipment. G4RMT can probably tell you more about it, if you are interested.