Don't look at the antenna

The scene is set. It is a crowded mall on a Saturday evening. I'm
wandering aimlessly in the mall awaiting the arrival of my cousin. I
see a "Tata Sky" booth. A sales boy and girl are standing next to the
stall. I approach the booth.

Me: Hi, what is the subscription charge of this thing.

Boy: 300 bucks a month.

Me: Oh!

Girl: Yeah, its 300 bucks plus 4 grand for the installation.

Me: Oh!

Boy: Yes, you have this small antenna which you have to put up in the
terrace (gives a pamphlet with a picture of a small dish antenna).

Me: (declines the pamphlet after a cursory glance) OK, so it works on
the principle of line of sight (pointing at the antenna).

Girl: No no.. you don't have to look at it for it to work.

Me: (lifts eyebrow) Hmmm .. Thank you. (controls laugh, leaves)