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By using dp34, you eliminate the switch inside the lnb. With DP 34 you can not separate the feed into 2 tuners. In that case you need 2 lines for each receiver and another one to your other receiver. Total of 5, which would not work with your dp34. What you need is DPP44 switch. You take one line for each dual tuner receiver and separate the feed. The 3rd line you would use it for your fifth room.