How do I replace wifi antenna
Weak wireless connection. Can I replace the antenna?
Just in case you want the Top antenna too, which is actually your Bluetooth antenna, you can get that one right here
While Dan is absolutely right that Apple's commitment to
a̶n̶t̶i̶-̶r̶e̶p̶a̶i̶r̶ sleek and elegant design makes it costly and difficult to replace or repair the antennas, consider just a wifi adapter.
You should be able to grab something like a TPLink AC1300 for around $20-$30 at your local best buy or walmart. It just plugs into a USB port on the back and has it's own built in antenna. As long as you can get the drivers installed properly on your iMac it should address your issue. Pictured here for reference as I use it in my shop and it gets around these things for most modern computers.
It's more of a cover up than a fix, but sometimes that is the most efficient and effective solution.
While you can replace the antennas, it is both very costly and likely won’t fix your issue.
Can you tell us which wireless connection you are you having issues with: Bluetooth or WiFI?
Also tell us what you are accessing and where it’s located from your system (distance)
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