Firstly, yes, so long as you are NOT mixing antenna types and coverage patterns on the *same radio*, you're fine. that said, I would not recommend 2.4Ghz for mesh. It has the highest noise floors, most interference and contention, and will be subject to higher environmental issues that can cause link drop or severe impariment. Additionally, there's only 3 available channels, all of which will offer the lowest throughput due to the higher noise floor and contention.