I will have 4 stella sectors and R5H s on top of the same building.
Im working in 5.8Ghz Frequency.
They are working in 900Mhz - 1900Mhz and there are hell of a lot GSM antennas on the building, as it seems to be a main POP of them.
Should I expect instability ? Will I get effected ?
no problem for me and there are 28 antennas on the roof.
so neither throughput or pings get effected ?
Why would they? They are on a completely different band.
All are right they are different band there should be no problem but they create electromagnetic wave that can affect; I have the same problem near me at 4m is a GSM tower and it affect my throughput, but it is not significant because I have XR5, you must test and see.
Best Regards Remus
you could put the device in a shielded metal box …
Can you give an example about a shileded box ? Any metal box would do ?
yes, most metal boxes will do. this usually helps against interference both from and to the board
something like http://www.nimwave.com/index.php/lang-en/prodotti/1-apparati-wireless/36-cpewave-ag-plus
or ask any dealer from:
http://www.mikrotik.com/mfm.php
thanks normis
any other action that I can take to minimize the possible effects?
doush change the building-we have problems on one mosque in sarajevo with GSM antennas 
I cant change the building cos it will delay the operation a lot and currently im setting it up so Im just hoping now.
momi; Did you use shileded metal enclosures ? it didnt help ?
I thought that there should not be a problem if you put Wifi near a GSM Base-Station, but recently I’ve tried and there was a big problem (1km link singnal strength -85dB 5GHz ).
I would recommend you if this position is critical to you then put the pole as far as you can from the GSM BS. If there is 5-6m distance between the BS it should be enough.
Interesting part is that we can see the major problem when using 5GHz band.
Good luck 
Ilija
yes we did use shielded metal enclosures but it didn’t work so well. If you can change height of the antennas e.g 3 or 4 meters above or below GSM equipment it would gain some improvement…
Good lock
Momi
Someone is suggesting a FARADAYS CAGE . ??
could be helpful ?
http://en.wikipedia.org/wiki/Faraday_cage
sounds good to me, where will you get one?
The principle used in metal outdoor enclosures is that of the so called “Faraday Cage”. Every carefully constructed metal based enclosure has that effect, causing the outside electromagnetic field to not affect the work of the equipment inside. The biggest problem than, relies in the fact that it isn’t the interference directly to the routerboards and cards the only one that causes problems. It’s the interference around the cables and antennas the most important one, and you can’t put an antenna inside a “Faraday Cage”
@ Normis
Im currently looking for thick metal enclosure that would act like a Faradays cage. If you know one tell me
@ GuJack20
Yes thats how I thought but again Im thinking somehow that an LMR-400 cable can act like a faradays cage since it has enough thickness but not sure though. But I dont know any solution for the antennas as you said.
Grounding the whole equipment including the R5H s may be another safe bet to take.
The site will have more than 100 customers and I dont want to deal with 100 angry customers.
Im confused.
Distance from the GSM Antennas is important. Since their antennas transmit towards the horizon, the best place to be is above or below them as far as you can get. This is where their signal will be weakest. The Metal Box is good, make sure you ground it. I suggest a trial system at first, see if you get good performance before committing to the location of equipment.
Steve Loomis
Oklahoma, USA
Ok as an update to this thread
My 2x90deg setup with R5H is completed and have a few customers running on it without any problems for now. Everything looks fine for now.
I have used metal boxes, grounded the boxes, one mpci per board to reduce interference, and got as far as I could from GSM antennas.