That is a subject all to itself.
In about 60-some years in radio, with towers in swamps, on hilltops, in tidal flats, in industrial parks, on mountains and just "outside of town" I never, ever found a dead or wounded bird at the base of a tower or even on the property. And those locations were everywhere from Argentina to Mexico to Puerto Rico and then New York, Ohio, DC, VA, AL, TX, AZ, CA and even Pakistan.
There have been numerous pieces of legislation intended to protect birds, yet the birds truly seem to be smarter than our legislators.