Wireless Coverage - Meraki AP

I may need to install a Meraki MR-18 Vertically, I normally mount  horizontally so have a good idea of coverage but don't know what the coverage will be like when mounted vertically. I looked at DataSheet but don't understand what the chart means.

Could someone explain what is means. I see little numbers, -5 , 0 and 5 within the chart and on the outside of the chart I see various number, 0,330, etc what do those indicate?  The place I am installing it a courtyard which very little interference or anything which would block signal. Thanks in advance for your help. Please see attached.
Tim OBrienSystems EngineerAsked:
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Tim OBrienSystems EngineerAuthor Commented:
Sorry I forgot to upload pic
MerakiCoverage.JPG
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David Johnson, CD, MVPOwnerCommented:
a change in the antenna orientation (vertical/horizontal) will result in a 3db loss (every 3db is a halving or a doubling of power)
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Tim OBrienSystems EngineerAuthor Commented:
So this chart is not providing any information of how much coverage I can expect? The courtyard is about 40 Yards X 30 Yards. I was planning on mounting Two AP's in each side of the courtyard.
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Craig BeckCommented:
...and the rest.

Expect the antenna to propagate significantly less across the room.  You should expect a drop of at least 10dBm 20ft from the AP when compared to its horizontal orientation.
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Tim OBrienSystems EngineerAuthor Commented:
Could you let me know what the chart is stating, for example of the right hand side where the -5,0,5 is location with the numbers 60,90,120 (outside of the circle) I still don't understand what the BOLD lines within the chart indicate.
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David Johnson, CD, MVPOwnerCommented:
I'm using the datasheet as a reference, if you have another I'd like to use it so we are both looking at the same information.

The first diagram is showing in one orientation the radiation pattern is almost perfectly circular (omni-directional) but if you orient the device horizontally then the radiation pattern is directional but not a pattern that one would expect from a directional antenna.  The numbers -5,0,5 are just reference numbers.
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Craig BeckCommented:
The coverage pattern you uploaded shows the propagation pattern from the antenna when mounted on a table or ceiling.  There should be two different elevations.  One shows from above and one shows from the side.
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Tim OBrienSystems EngineerAuthor Commented:
https://meraki.cisco.com/lib/pdf/meraki_datasheet_MR18.pdf

I used the link above, I just assumed the chart would give approx distance coverage, the -5,0,5 and other numbers around teh circle  still mean nothing to me. It would be helpful to know for example assuming no inference you would get coverage of X Feet by X Feet as compared to if it was mounted horizontal. I appreciate all the input but I still have no idea if two AP's mounted Vertically would provide sufficient coverage in a 50 Yard  by 25 Yard courtyard.

Seems like this chart is telling how the signal propagates and how much signal is lost? Which isn't as nearly as helpful as a chart which gives estimated coverage,
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Craig BeckCommented:
The image on the left for each frequency shows the pattern when you look at the AP on the ceiling.  That's the optimal position to cover a longer distance across a floor.  Expect the AP to propagate 10 - 20ft downwards.

On that note, expect the same across the floor when mounted on the wall, across the floor, but better penetration through the ceiling/floor.
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David Johnson, CD, MVPOwnerCommented:
If you can see the access point you should be able to connect to it. You could use a cheaper access point to test.. All access points have the same maximum permissible power level (in the order of milliwatts).. You should do a RF site survey and look for possible interference from other devices in these 2 bands (2.4/5Ghz) 2.4 is rather crowded.
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Tim OBrienSystems EngineerAuthor Commented:
Thanks gentlemen for your help!
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Craig BeckCommented:
With respect, that's not how it works.  You could see the AP but there could be so much noise on the channel that the signal is unusable.

Also, using a cheaper AP isn't the best way to test.  The best way to test is to use the actual device.  As well as that some cheaper APs tend to use higher power output.  For example, Cisco Aironet APs have a maximum output power of 100mW while Engenius have a 600mW AP which is exponentially cheaper.
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