I currently have an antenna in my attic feeding 2 TVs through a conventional 2-way splitter. Here's a rough illustration:
---> TV1
antenna ---> splitter
---> TV2

I am thinking of adding a Channel Master CM7777 pre-amplifier to my antenna. It would look something like this,
<---> cm7777 power ---> TV1
antenna ---> CM7777 <---> splitter
----> TV2
I understand that I cannot use the same passive splitter since not enough power from the CM7777's power unit can get through that splitter to the CM7777 pre-amp. Plus, even if it could, I am concerned that the DC might feed back to TV2.

I've recently learned that there is another kind of splitter called a power passive splitter. One such example is the Eagle Aspen P7002AP (found at the SolidSignal.com site).

As I understand it these kind of splitters will pass all the CM7777's power unit power through to the pre-amp so it looks like the kind of splitter to use. But I am still concerned about DC feeding back to TV2.

The P7002AP documentation says it's "all port power passive". There's also a P7002 and its documentation says it's "single port power passive".

So if these splitters are the kind to use which one should I use? Or does it matter? Will either block all the cm7777's power unit DC back to TV2?

You want a splitter that only passes DC through one leg.

http://www.cableandwireshop.com/holland_1_ghz_2-way_power_pass_cable_splitter.html

http://www.cableandwireshop.com/images/super/GHS-2P_800x600t.jpg

Thanks for the info. So Holland GHS-2P looks to be similar to the Eagle Aspen P7002. I just have to decide which one to get. Probably the P7002 since I had intended to order the CM7777 from Solid Signal and there's no sense paying separate shipping charges.