It sounds like you got good installer that will stand behind his work.
He picked the one-antenna solution which avoided having to combine two antennas.
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1. I now have a tivo, which is a 4 tuner box.
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The TiVo tuners are sometimes not quite as good as some TV tuners, so there might be a problem with marginal channels. The TiVo does have a diagnostics screen that gives signal strength, SNR, and uncorrected errors to help you with problem channels.
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2. the other night during some mist/rain, channel 61 became pixelated?
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Since it is coming in the back of the antenna it would be one of your problem channels. The best reception is when an antenna is aimed directly at the transmitter. The diagnostics screen can help you with the minimum values for signal strength, SNR needs to be at least 16 dB, and uncorrected errors should be zero.
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3. would putting a small amp right in front of the tivo help?
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Maybe yes, maybe no; you would have to try it because you don't have a way to measure signal strength except with the TiVo. Maybe this one will help:
one output
http://www.channelmaster.com/Antenna..._p/cm-3410.htm
2-way
http://www.channelmaster.com/Antenna..._p/cm-3412.htm
4-way
http://www.channelmaster.com/Antenna..._p/cm-3414.htm
Your antenna already has a 20 dB preamp, but your antenna is aimed away from the strongest signals, which reduces the chance of overload.
http://www.skywalker.com/Products/Di..._DIGI2002.aspx
http://digitenna.com/files/DigiTenna%20DT-XF.pdf