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I am doing the link budget for a device several hundred meters away from the typical cell tower. I have already found out how much antenna gain for that device. I am wondering how much antenna gain should I assume for a typical cell tower?

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Start by looking at the geometry. Power doesn't come from nowhere. You have to take it from other areas. So, we have a tower with a cell antenna on it. If you read up on cell towers, they usually have three antennas, each operating a 120 degree section. So, we can take that power and direct it elsewhere for some gain. There's also no sense transmitting into space or the ground, so that'll give us some more gain to play with. I'm not going to answer this for you, but I'm sure that you can come up with a decent approximation if you search out the radiation pattern of one antenna of a cell tower. It's a decent starting location at least. If all else fails, assume a gain of 0 dB. You're guaranteed not to underestimate in that case.

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a cell tower usually have 8-10dB gain antenna for a target beamwidth. High gain antennas are usually not utilized (only on special and specific cases) as it pollutes the next cell.

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