Zigbee/ZWave radio propagation from Hubitat

Background: I'm having some intermittent Zigbee issues. I have a couple of Zigbee items that will randomly fall off the network. This may be due to the fact that I have 42 Zigbee "things" and only 2 plugs serving as repeaters. I just ordered a couple of Peanut plugs to try to strengthen my mesh. Maybe that will fix the issue.

But, this got me to thinking...
What's the wave propagation look like coming out of the stick on the original hub? If I have the hub lying flat on a surface, is the stick orientation correct for a correct wave form? Additionally, is the signal stronger on the end, or the sides? Just looking to optimize my signals.