Hi @dpsguard 

From a prior post by @R1D2 and @Fae  

I have not personally tried it.  But realistically at ~25-35 feet through free air, I think you'll be fine.

I use the signal from my EAP225's and 245's across multiple (2) floors in my house.  One on the second floor pointing down and one on the first floor (at the other end of the house) pointing up.  While less than 35 feet (more like ~15) the signal (of the AP and STA) are penetrating the flooring, too.  Works fine.

-Jonathan

@JSchnee21 

Thank you for this useful information. Definitely, my application is not home use, but for a free wi-fi set up at a commercial place and will have many many APs.

So my use case will have most APs at about 30 feet high. As per this formula, assuming that coverage pattern is in fact like a cone of 150 degrees, it will provide coverage almost in a radius of 100 feet. The formula does not take into account the frequency band, and transmit power.

For typical smartphone use case, we will typically like to balance the transmit power and maybe have it 3dB more than typical transmit power of cell phone (which could be about 10dBm). So formula needs to take into account transmit power and the frequency.

I assume this formula is more like for 2.4GHz with a high power. For 5GHz, we typically see 6dB loss as compared to 2.4GHz at 50 feet away and thus distance / range will be half (distance square equates to power doubled). So should we assume that for 5GHz use case and power set to medium, coverage is more like 40 feet radius?

This is what I assumed and then to allow roaming overlap of 10 feet in between any two APs, I had thus come up with AP to AP disnatnce of 60 feet when mounted at about 30 feet high.

Thanks