Ratman - You have the basic set up correct. The 3 way actually feeds 2 TV's and an HTPC (Formerly a VCR) with a Ceton Infinitv4 Tuner. TV 2 probably has the longest run, about 55 feet, with TV 1 a close second. The HTPC is probably 45 feet. All hoem runs and RG6 Quad I think. The Comcast cable/phone modem is about 30 feet. TV 1 is served by an SA Cable box and has suffered no signal issues. TV2 had the loss of signal on some channels, but came back by itself. The Ceton had the -4.5 db of signal and was dropping off line daily. Since it is now stable for 4 days I am suspicious soft signal was the problem (though mfg says -10 to +10 is ok), though more time must pass to confirm.
I was not aware that there are balanced and unbalanced splitters so your info was very helpful in that regard. I have the 4 way splitter still in its package so can return if you think that is not the best way to go. With the above new info I provided, if you can confirm how I might better set up the splitters and recommend a model to buy (not sure local places have the special splitters), I would be much in your debt. Doing your math, I wonder if I really still have 13 db of signal to start with.
Assassin HTPC + Echo, Sony 49XBR850, McIntosh MX151, MC202, MC7104, MS300, B+W 803D2, CWM's, Janus 1W Sub