Here's the situation.

12 unit bldg.

4 units per floor for three floors.

2 of 4 units on each floor have a shared utility room with pipe stubs in between each floor separate from each other.

Each unit has a dedicated 6 way splitter in the utility room.

Each unit would have a dedicated 2 way splitter from the main trunk to the 6 way splitter.

Antenna(s) will be in the attic no trees and relatively clear from any other buildings in all directions assumed no 110 power available up there.

Coax from the ground floor to the attic and a reasonable distance leftover for looping in each room and positioning in the attic lets say 75' total.

If there were 4 antenna's, each would supply three units in a line. #12 on 3rd, #8 on 2nd, and #4 on 1st.

Each unit has five coax outlets. 1 in each bedroom, 3 in the living room.

Considerations:

TV signal analysis here figured at 50 feet:

http://www.tvfool.com/?option=com_wr...073b1c0dbf9cd6
Winegard HD 7698P or Channel Master CM3020 from SolidSignal.com

1.4-2.0dB loss per 100' of RG6. Worst case 0.02 loss per foot = 1.5dB total.

Each outlet of the 6 way splitter will cause 3.5dB each. Avg. use per unit, say 3 = 10.5dB.

Each outlet of the 2 way splitter will cause 3.5dB each so 7dB.

Use terminators on the unused outlets in the units and on the splitters.

Total loss with this setup = 19dB.

I anticipate using one dedicated amplifier with a gain of 24dB max., variable output for each unit and cheap of course

between the 2 way and 6 way splitters.

So, that gives each unit a gain of 5dB overall.

Is it ok to average it like this or should I be thinking more linear?

Example:

#12 has 12' of coax so 0.24dB + 10.5dB + 7dB = 17.74dB lost.

#8 has 24' of coax so 0.48dB + 10.5dB + 7dB + 17.74dB from the unit above it = 35.72dB

#4 has 36' of coax so 0.72db + 10.5dB + 7dB + 35.72dB + 35.72dB = 89.66dB

Therefore, the 24dB gain of the amps will only work for #12 and they will not be big enough for #8 & #4?

Actually, now that I think about it I planned for loss from 75' of coax but have only accounted for 36' getting it to the first floor #4 on the ground?

Ok, somebody throw this dog a bone. Comments, suggestions, different antenna's and amps would be appreciated.