Analog-Digital Conversion Problem

[mhz40]

Would Rg11 provide a better quality signal than Rg6 when the signal comes from an antenna and travels over a 100' to a three way spliter.

Nope. At 750MHz, RG11 will lose around 2db less than RG6 at 100'.  Signal level meter error on the gear the techs use is about 1.5db.

If you run that RG11, that extra 2db will 'buy' you the first 30' worth of RG6 signal loss on the output of the splitter.