What you get is a RF transmitter and receiver. It is generally not recommended for picture quality. I have used one for transmitting a satellite signal inside my house. It was OK for a 14" TV....
On the other hand VGA cables tend to become unhappy when the length increases. You will have to pay quite a bit for high quality cabling (coaxial for the RGB signals). You will find one of the top companies in Sweden.
If you are able to use a cable, why not just go with a VGA amplifier? They can be had for next to nothing on ebay and work very well. I had a poor, dim, picture on my 50 foot VGA cable until I used an amp.
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