Depends on what you want UHF/VHF
If you are looking for a cheap solution there are lots of old, but very good Miron systems for sale.
If you’re loaded, RMS2020 are the industry standard (TV)
Also new to rms are the envoy, designed with camera mount in mind – personally, I’d hire a sound recordist.
Have a look here New kit : http://www.soundkit.co.uk
used kit http://www.bblist.co.uk