I had a digital TV antenna in Oshawa pointed direct at the CN Tower in Toronto, there was only one tree in my direct line of sight, come summer when the leaves

I had a digital TV antenna in Oshawa pointed direct at the CN Tower in Toronto, there was only one tree in my direct line of sight, come summer when the leaves were fully developed I lost a number of channels because the signals was not strong enough. The tree was not on my property so I could not cut it.