Plenty of claw shaped appendages,freedom from ground based predators and the perfect place to let go in the toilet department.
If your TV aerial is roof or chimney base then the continuous supply of guano from the local bird population is not a problem.
However today's modern houses have no chimney,so the aerial can go in place only which is straight over you drive way or in other words right over your shiny new car,or straight onto your drive way where you can walk it into the house,or curious toddlers can start checking out the strange white patch on the ground.
Both situations aren't very good bird guano contains a lot of substances that can damage a cars paint work,and it contains some pretty unpleasant diseases and parasites that can be picked up by human beings.
There are a few limited ways to stop the birds perching on your aerial,some work better than others,if you need help with this call us for advice.