There are a few pants broadcast mixers about so watch what you buy and the older ones
could bring servicing issues, i.e. 24 hours on, years on end, bad caps etc. Routing
options may also be limited and get used to D sub connectors.
I have used quite
a few Soundcraft broadcast desks and found them basic and reliable but nothing to write
home about regarding audio fidelity.
Have fun looking for one.