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Either jointenna will probably work. I said 9 because I would guess the pass and notch filters to be tighter for the slightly lower frequency. I have experience that a ch 12 jointenna passes 11, 12 and 13. My concern is I dont know how wide the knotch is on a ch 13 jointenna and I wouldn't want the notch on the channel 13 jointenna to hurt channel 9. With the design of the filters used in the jointenna, the higher the frequency, the wider the notch or pass for the filter. So I suggested the channel 9 jointenna because the center frequency for channel 9 is lower than for channel 13 leading to tighter filters and hopefully less interaction between your channels. I have not used a scope or frequency generator to examine a jointenna, so I could be completely wrong.
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