Also to go more into your question about if you should EQ up certain frequency ranges... That won't do anything because of the way radio processing works. The only thing it might do is cause your limiter (if you're using one) to over-act on that range...
Now in some cases that can be a good thing.
You CAN bias how a track will sound on a radio processor by controlling the peak to average ratio within a frequency range. That's how you can give your song a specific character on the radio. But as Earle was saying, there isn't a need for it, and personally I don't recommend it.
But taking the knowledge of this one step further, with some skill and very careful listening, and with visual feedback from Har-Bal to help you learn to hear this... You can use band-pass or multi-band expansion on certain frequency ranges to alter the peak to average ratio, so that you don't have a specific range of audio that has too much average level.
This is especially apparent on the radio when it's above like... 1kHz. Partly because many radio stations are already going to be smashing the living daylights out of everything above there, but the radio processor also has to deal with pre-emphasis limiting & clipping, usually multi-band. So that can really kill the SNAP of transients if the average sound is too close to the peak sound.
Some band-limited expanders I've had good luck with fine tuning certain peak/average ratio issues with, are:
Sonalksis CQ1
http://www.sonalksis.com/index.php?section_id=100
Voxengo Transmodder
http://www.voxengo.com/product/tmodder/
And there are others out there, feel free to reply back if you have any luck with them, especially if they are as transparent & good sounding as these.
It also helps a lot to have a knowledge of WHY radio processors are responding to average/peak ratios this way. If you are looking to get serious about creating masters for radio, read yourself up on not only how modern radio processors work, but the history of radio processors. All but the most modern of digital radio processors (like IDT DVP) are only glorified analog circuit emulations anyways, including Omnia 6, and Orban 8500. So at least research the major breakthroughs in radio processing history, at least into the end of the 1980s, and you will understand the basics of HOW radio processors handle average/peak ratio by design, and you will also then be able to recognize peak/average trouble frequencies in a particular track or musical phrase, and how to properly and adequately compensate for them.
I've gotten to the point now where I don't make a different master for any format at all, CD/radio/vinyl/etc, and it seems to be working out great for my clients. Due to my work somehow getting popular in the UK (so far), I usually have 2-3 new tracks I've mastered playing on BBC every week, among other networks. And I haven't had any complaints yet.