I have a radio website as well, and I have been using ZOPIM. The free version is quite good, which is what I use. Great dashboard too. Check it out.
I was using zopim but it made my webpage very slow and you can't really manage the design as much as you want. Pictures and videos are in small quality, There is no video and voice chat, it doesn't work well on phones eithre.
Yes free is free but depending on the features your looking for free may fit.
A lot of cost apps may offer more but do they? Or are they just simple mods to another app that's free. Either way the user decides.
The best chat app to use is Trapeez.it is very popular app and it is very easy to understand.Trapeez is a Tumblr customer made by the same fine people that made the Blaq customer for PlayBook. In spite of the fact that regardless we're tending to Blaq on BB10, Trapeez makes a similarly fine showing with regards to with flipping through your most loved Tumblr websites,
guys, i highly recommend Chatwing. 1st of all it is free for unlimited usage.
2nd of of if you want the full white label service, it is only $11 per month for unlimited usage. All these other service charge based on how many users you have. Plus chatwing has iPhone and Android apps so you can get alerts when people are chatting in your rooms. enjoy.