I want to feed the SD output from an 811 to a splitter in my media closet so I can feed two other TV's we don't use all that often. There is no COAX output on the 811. All I have is an extra coax run from where the 811 is situated to the media closet in the garage. This is about 60 feet. Will an AV to RF convertor provide satisfactory SD picture quality? Do I need an amplifier? If so, what brand of RF convertor is recommended. Thanks.