There are flat cable jumpers that let you close the cable in a door or window.

They're not the best, but better than an indoor antenna...

What about using something like this?. .......

Flat Cable CCTV JUMPER Dish Network and Directv Approved https://www.amazon.com/dp/B003ZVRU1S/ref=cm_sw_r_cp_api_i_4ytHDb7A3NTSC