For years I've written articles for Radio Magazine, and they've been published in the hard-copy version of the magazine. You can see them in the on-line version as well.
I picked out a couple of recent favorites of mine:
http://beradio.com/transmission/radio_transmission_precorrection/index.html This is an article about pre-correction for HD radio.
http://beradio.com/antennas/radio_final_element/index.html This is an article on capital budgeting for HD.
http://beradio.com/features/radio_disaster_strikes_during/index.html Here is an article about the aftermath of Hurricane Katrina.
If you are interested in more, check out the search results for "Doug Irwin".
http://beradio.com/searchresults/?terms=Doug Irwin&ord=d
Thanks! Feel free to give me your feedback as well. I'd love to hear from you.