tv is 20 yrs old and does not have composite hookups, only 1 cable input. can i use digital converter box instead and still be

A digital converter box is to tune in over the air digital broadcasts, down convert the signal to SD TV, and output it through av or RF for older SD TVs. It doesn't have an input for anything else. You can connect a converter box and the Roku 1 to the RF modulator below and when the Roku is off the converter box will be connected to the RF input of the TV.
http://www.amazon.com/dp/B00J41Y4YY?psc=1
Should work fine.
 

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