wireless access point speed

Good day,

I need some enlighten me on an issue I am having with WiFi at a client. I have a client who is using Comcast and the internet speed is 120Mg. That is the speed I get on all the computer using Ethernet, my issue comes in when we connect a Access Point, the speed goes down to 5 or 6 and if we are lucky 20.

I have tried two different access points from Ubiquiti  and a Linksys. Any ideas. Thanks
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rudym88Asked:
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Darrell PorterEnterprise Business Process ArchitectCommented:
How is the AP connected to the Comcast modem?  Be specific - 3 foot cable?  7-foot cable? Infrastructure cabling with patch cables?

What kind of wireless adapters are you using?  If USB-attached, expect poor performance.

Did you check for interference from other wireless sources?  How strong is the signal at the workstation?
rudym88Author Commented:
Thanks for the reply,

After trying many configuration, the must two straight forward configurations I did are the following;

Ubiquiti Unifi AP (using PoE), connected to the Comcast modem, the wire run is about 50' and  is running straight from the AP to the modem.

Ubiquiti Wireless Router, connected to the Comcast modem, the wire run is about 6' and  is running straight from the Router to the modem. When using the wireless router, if I connect my laptop into one of the LAN ports the speed is 120 as expected.

The end devices we are using, include iPhone 6, iPhone 5, Lenovo laptop with build-in intel wifi card.
Craig BeckCommented:
Have you set the AP and router to use the same channel?  If so, that's probably your issue.  You need to set each AP to a different channel.
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Darrell PorterEnterprise Business Process ArchitectCommented:
Craig makes a good point - I would actually recommend turning off all wireless functionality on the Comcast modem, including their xfinitywifi wireless network.

While they claim it has no impact on your connections performance, others have demonstrated it can have a significant impact on performance.
rudym88Author Commented:
The solution was to disable 2.4Ghz and only use 5Ghz

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rudym88Author Commented:
no one provided a solution
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