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You always want to put an amplifier as close to the signal source as possible so that you amplify signal and not noise. The drawback is always that a load on the end of a long run can cause voltage drop problems.
If you have AC power available, I recommend that you take advantage of it, use and AC powered amplifier, and reduce the load (and voltage drop) on your coax DC power. The amplifier would need a DC pass-through since you need to power your LNBFs.
If AC power is not available, the LA-2150D amplifier works well for a reasonable cost. I would stick it in the middle of the run to reduce the voltage drop at the LNBF.
I know nothing about how the Dish Network receivers work, so can someone chime in? What I'm thinking is that I would install a power inserter as close to the dish as possible if there is no requirement for DC switching of the LNBFs.
Good luck!
Al
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30W to 123W in Arlington, VA
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