stacked halo, non conductive boom vs conductive boom

[mr_fx]

I am wondering what issues would arise from using a conductive boom on a quad stacked halo antenna vs a non conductive boom.

As I am planning a 4 stack, PVC might not be the best choice for a boom (nearly 13 ft long)

 

[W5LZ]

It could result in the 'stack' becoming directional. The most common way around that is by mounting the antennas 'around' the mast rather than all on one side. With 4 antennas that would mean every 90 degrees. Like the antennas on a typical repeater or TV station. If it would have some benefit, you can make that 'stack' directional too, but that sort of defeats the purpose (depending on your purpose).
- 'Doc