I think she is referring to the ground block, which usually has more than one feed-thru. So you could put Dish on one and the antenna on the other. While it will not withstand a lightning strike it will reduce the likelihood of differential static buildup ruining your receiver.
Make sure the 10 dB amp is 10 dB to each outlet, I have a 4-way, and it does help as I am 49 miles from the towers, LOS from under the deck. Then again, I diplex in 2 722s, potentially 4 channels--60 62 64 66--along with the OTA (ATSC and NTSC for now) for distribution to the 722s, a 622, and 2 TVs via 3- and 4-way splitters.
Note all amplifiers may fail to help if you have nearby radio or cell or other TV towers or an airport, etc., as they may overload the amp or its load.
-Ken