# Connect cantenna to WiFi card.

Joined Jan 12, 2021
79
Hi Folks. Hope all is well.
I am looking to build this exact cantenna that is shown in the pic/link below. ( The guy selling them is legit and has a YT channel)

https://www.ebay.com/itm/114962061279

I want to connect the cantenna to the laptop's wifi card.

Is the connector shown below the correct wire to use to connect the cantenna to the wifi card?

Thanks for the replies!

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#### Ya’akov

Joined Jan 27, 2019
5,663
Yes, that is a UFL connector and there is only one size.

As an aside, the loss at WiFi frequencies in coaxial feedline is quite large. In fact at 5.6GHz the loss for 1m of RG174U like that pigtail is 58%!

You are going to want to keep the feedline as short as you can, and if you have to extend it use much larger lower loss cable. It is inconvenient but if you want to benefit from the antenna, it‘s necessary.

Joined Jan 12, 2021
79
Yes, that is a UFL connector and there is only one size.

As an aside, the loss at WiFi frequencies in coaxial feedline is quite large. In fact at 5.6GHz the loss for 1m of RG174U like that pigtail is 58%!

You are going to want to keep the feedline as short as you can, and if you have to extend it use much larger lower loss cable. It is inconvenient but if you want to benefit from the antenna, it‘s necessary.
Can u please gimme a math formula to calculate the losses?

Todah.

#### Ya’akov

Joined Jan 27, 2019
5,663
Can u please gimme a math formula to calculate the losses?

Todah.
You need to look up the loss of the coax. This table is a good starting point but a datasheet is better. The loss in the table is per 100ft, which is a common way to list it, just divide the 100ft by whatever length you are using.

Remember that 3dB is half your power!

#### LowQCab

Joined Nov 6, 2012
2,054
Try using a "Wind-Surfer" Parabolic-Reflector first,
You might be amazed at how well they work.
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Joined Jan 12, 2021
79
Try using a "Wind-Surfer" Parabolic-Reflector first,
You might be amazed at how well they work.
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.
.
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Thank you for your reply. I am deliberately trying to achieve what I want, using a cantenna because this will be my first cantenna project. I learnt a lot about the cantenna's physics/math and want to go through the physics/math in my head while I build it. I wanna get the thrill of building my own cantenna. I will try the windsurfer parabola at a later date. Ty again!