A properly secured wireless network will significantly mitigate the risks of this happening.i rather the wired system, it always works and i don't have to worry about others using my network.
We have video senders at home and I tuned them to channel "D" (not sure if these channels are standardised and it's difficult to establish the precise frequency used by many video sender channels) and my wireless LAN to channel 1 so that each are at different ends of the 2.4GHz spectrum and they don't interfere too much with each other. When both are in or around the same frequency (e.g. channel D and channel 11) then you can certainly see the interference!plus the wireless modem interfers with the video sender we use at the mo and i have to listen to mrs burgundy compain about it.