Most of the trade shows I’ve attended are cluttered and densely packed. There is no way your sign is going to be seen from 20-30 feet away unless you rig it from the ceiling. And even then no guarantee if there are 30 others doing the same thing. Depending on your industry, and the size of your floor space something more memorable might work for you. An installation of some kind.
So maybe do a web search for images of the show you plan to attend. What’s the floor layout? Where are you located? What is the most likely direction of traffic?
Maybe do a web search for Award Winning Tradeshow booth to get some ideas.
Side note: Depending on the venue, you may have to hire someone to install. If the venue has union labor, you better make the arrangements to use it.