Hi. I have a question about using an amplifier, yes I have searched but wanted to make sure I have got it right.

I can not get Terrestrial Freeview, I am dish only. I have a standard Sky box in the lounge (with the RF out). I want dish + Sky RF out to the bedrooms (x4), so that bedrooms can watch Freeview with a set top box but also see the channel the Sky is on.

This is what I have got: (calling each run of rg6 A1, A2... etc, all rg6 is quadshield and terminated with f connectors)
From the LNB to under the house (A1) to two way splitter (outputs A2,A3). A2 goes to lounge as input for Sky. A4 is from Sky RF out.
A3 and A4 are diplexed together (output A5)
A5 goes to a 4 way splitter (outputs A6-A9) to each bedroom (with diplexers in the bedrooms to separate the signal where required).

A1 is around 15m to underneath the house where the Sky is located in the lounge, all the splitters etc are located at that point, then runs to the lounge and bedrooms are around 5m x3 and 20m x1. I get good dish signal in the lounge at the Sky box, no problems there. In the bedrooms however, is very poor dish signal (unwatchable).

I'm thinking an amplifier will solve my issue.
1. What sort of amplifier should I get (passive, 240v etc - power source is not a problem)
2. Where should I put the amplifier it (ie on A1, amplifying everything, or at A3 (or A4?) just amplifying before the 4 way split?)

Thanks