I'm not. Conservatives get way more airtime on MSNBC than liberals get on Fox.
Since you cannot possible monitor both broadcasts yourself, I wonder how are you arriving at that conclusion. Link?
I haven't monitored every minute of the day, so it's of course based on observation (just as your statements are), but look at both network's schedules.
Name the liberals hosting opinion programming on Fox. Only one I can think of is Bob Beckel on The Five, along with his four conservative co-hosts. In the "hard news" shows like Special Report, you've got the "Great American Panel" at the end which typically features the host (Baier, who's never heard a Republican talking point that he couldn't spit back out with a straight face), two conservative columnists, and one liberal. Hannity used to have Colmes, but even then he was 80% of the talking and 95% of the volume. Guess they figured the remainder was too much.
Now lets look at conservatives on Fox. Morning Joe technically has other people on it, but Scarborough drives the conservation. One of the other co-hosts (Geist) is someone I enjoy listening to, but he's basically Scarborough's Mini-Me. In terms of the regular panelists on the show, you had Dan Senor for the longest time (who's now a senior adviser to the Romney campaign), Maria Bartiromo, and Jim Cramer. Tucker Carlson had his own show on the network for years. You've got a similar outgunned angle to The Five with The Cycle, with S. E. Cupp playing the lone member of the network's minority tribe. Pat Buchanan was also a long-time contributor to the network. On the "hard news" shows, the question is left-leaning because it's driven by the host (Matthews, et al.), but it is typically a one-one split in terms of the guests (unlike the aforementioned Great American Panel).