windows that face east is a decent start. The TV towers are all near Alleman, which is due NNE from Waukee. This is what I have mounted in my attic pointed towards the towers and they all come in great! https://www.amazon.com/gp/product/B00P20CD62/ref=oh_aui_search_asin_title?ie=UTF8&psc=1

I paired it with a tablo for DVR functionality.