I have a 6 ft outdoor antenna that goes through an amplifier before being split off to 4 TV sets. I purchased a Magnavox converter only to learn that it is only to be used on ONE TV at a time. What I need to a converter for the ANTENNA so that ALL my TVs will get the new DTV signal. Can anyone tell me a make and model number that has this? PLEASE - I don't have to have to buy 4 converter boxes! Thanks.