Yes, I have added one. It does improve the reception by 3 to 5 db. Which doesn't sound like much, but the db scale is logrithmic. Also, the aiming is more sensitive because the antena become more directional. I usually let the TV find the channels then I set the TV on signal strength meter and fine tune the aiming. The stronger the better. If you are in an area where the stations are in different cities, but close by; you may have to turn the antena when you switch channels.