I am presently using a legacy tablo which I’ve had for about 5 years. I want to add a gen four and still keep using my Legacy. My Legacy is presently hooked up to rooftop antenna. Would I need to use a antenna distribution device to run both on their respective apps? And how to hook up. Thanks in advance!
I have both my legacy and 4th gen Tablos in the same room. I do have a separate antenna for both, but you could just use a splitter to connect both to the same antenna.
For now, you would have two apps on each device, the one you are currently using for legacy and then the newer one for the 4th gen. At some point there is supposed to be a firmware update on the legacy where you could use the 4th gen app on it as well, but that will need to be well tested before deployment.
I hope that helps!
As long as you have good signal just a quality splitter will suffice. I use a splitter and I use an indoor antenna and it works fine. I have the same setup. Legacy Tablo and a Gen 4 Tablo. With the Gen 4 try scanning for channels with the internal amplifier off and if it isn’t picking up channels well enough (or not at all) turn it on and scan again. I will guess that you won’t need it.
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My setup is one legacy (2 tuner) and one gen 4 (4 tuner). I split the signal at an signal amp (splitter built in). All seems to be working well so far. I’m about 30 miles from the towers, single antenna, very few obstructions. I would try a splitter, see what happens and adjust from there.
I have aquired more than a few RF slippers over the years, but nowadays it’s not like there is a Radio Shack right around every corner anymore. 
My outside antenna to receive the OTA transmission from OTA TV stations over 75mi away is connected to RF amplifier, then 30ft of coax cable to get inside where a 1 to 2 coax RF splitter is connected. One split goes to the Tablo v4 with it’s internal amplifier Off, and the other coax split goes about 15ft away where another 1 to 2 coax RF splitter is connected sending one signal to my old Fire TV Recast, and the other to the ASTC capable HDTV tuner.
I first tried a 4 port RF distribution splitter I had, but it degraded the RF signal more than using two 1 to 2 RF splitters when I looked at the HDTV’s signal strength.