Remember The Big Dishes?
With the advancement of technology everything has become smaller: computers, phones and of course dishes with DirectTV Dish being an example. Due to these innovations in technology there are huge dishes left desolate in many people's homes / businesses. Some of them gather moss and vines... remember those days? Do you still see old time dishes where you live?
I used to pick up signals from a neighbor's dish using a normal TV and turning the channel to an odd number, because it was so big.
I agree with him for large areas where land is accessible it is not needed, but it definitely is an obstruction on smaller lots. What is more is it does attract a lot of attention, but if those are not of any concern to you then keep the thing.
What is bad is the ones that are left like relics with vines growing over it and rust tarnishing the original color.