Assuming all other things are equal, typically lower frequency radio waves exhibit less attenuation in free air than higher frequency radio waves. There are many other factors involved in this so this generalization really only applies when all other factors are considered equal.
2.4GHz and 5.8GHz frequencies are considered ultra-/super-high frequencies and are relatively subject to attenuation, so I’m not sure if the above generalization would show anything more than a negligible difference anyways. Someone else may be able to chime in on this with some kind of quantitative evidence.
I have a feeling that the bottleneck of radiowave transmission for our phantoms will not be based on the frequency utilized (either 2.4GHz or 5.8GHz), but more on the quantity of nearby interference, line of sight and, very importantly, the quality of the antennae -- the list goes on.
If you’re looking at FPVLR to supply your antennae, this may be a suitable P2V/P2V+ option (pilot side only):
http://fpvlr.com/shop/index.php?route=p ... uct_id=103
Check with FPVLR for your specific needs when it comes to antennae and connector types.
Totally unrelated, however, I am pleased to share this unit conversion with you given our recent encounter: meters x 3.28 = feet