Is it possible to convert a 4 tuner to a 2 tuner and hopefully get double the signal strength for recording??
No - the internal amplified splitter in the Quad tuner and Dual tuner is actually the same 1x4 splitter.
No but plenty of options for signal amps out there.
Personally this has been the best for me:
But this one did ALMOST as well for 2+ years:
I only upgraded to the top one to try to get ONE more fringe channel.
Either way though,an LTE Signal filter is also likely needed:
I’ve been using the Winegard Boost XT for the last 3 years. It works very well. Good tablo performance needs good signal.