An Amateur Television Down Converter. Do they exist.

I've read on Wikipedia where it states "ATV transmissions can be viewed by setting a television to cable input and attaching an outdoor 70 cm antenna. For more sensitive reception, some users may use a purposely-built ATV down-converter." How can I build one or can you find it. I could probably get an old cable box but it suggest that you can build a down converter for the purpose of receiving Amateur TV on your television.

rickharris5 years ago,or.r_gc.r_pw.r_cp.r_qf.,cf.osb&fp=8c9dafbc06612134&biw=1920&bih=960

Apparently kits do exist.
Graydant (author)  rickharris5 years ago
Thank you, I never could find them before on Yahoo I was searching for just Down Converters not a circuit.
Graydant (author) 5 years ago
I would still like to know if you can build the down converter cause they are costly.