What you're seeing is an interstitial pop-up ad being generated by TechRepublic.
TechProGuild is the subscription arm of TechRepublic. Subscriber content is as free as possible of banner ads and pop-ups. If you check the TPG Home Page as well as any of the articles linked there, you'll see there are no ads in many cases.
If you go to any 'free' content on TechRepublic, that content does contain ads. Plus, you'll occasionally get that interstitial ad when you enter the site at https://www.techrepublic.com. That ad is generated by the base server and because we're hosted by that server, you'll get it.
You probably won't see it if you enter TechProGuild directly at http://www.techproguild.com.
Removing ads from subscriber content was a benefit we added to TechProGuild almost a year ago. Like yourself, we felt that subscription content shouldn't carry ads. That content available to all still needs to carry an ad in order for us to be able to pay for it. Additionally, there are ads that appear for architectural issues that we have no control over.
John Sheesley
Senior Editor, TechProGuild.