Wifi issues with genuine Apple Broadcom card & mini PCI E adaptor?

[ovb1]

I bought this card combo of eBay shttp://m.ebay.co.uk/itm/400795926463?cmd=VIDESCeller....

Works fine in windows 7. But having massive issue with signal, reception and speed in Yosemite. I've tried moving the router and desktop so the antenna are basically facing each other across the room.

But it hardly ever connects and is poor when it does.

I even tried the 10.10.2 beta to see if that would help. It does but there is still a massive problem with signal noise ratio, poor signal lots of noise and massive Bluetooth issues and interference too....

I've tried all logical fixes but have run out of ideas?

Can anyone help? It's a 2.4ghz network on channel 1. I've tried other channels 6 , 12 but they seem even worse.

 

[ovb1]

My MacBook air and iPhone and other wifi devices all work flawlessly.

Just the hackintosh. I don't think its the hardware as Windows 7 is fine. But Windows 8 suffered the same issues as Yosemite strangely. I just happened to downgrade to 7 as 8 is a pig. IMHO.