Removing hiss left from wireless mic

After reading an online tutorial I've used the 3 Band Equalizer to remove some of a hiss in my video from a wireless mic, however, it still doesn't sound great. The sound is throughout an entire interview. Any help/tips you could give I would be really grateful.

Thank you, Laurie

FCP 7
Mac OS X 10.6.7
8GB
Processor 2.2GHZ Intel Core i7