If you want regional coverage on the low bands go NVIS !
I don't really have that many trees but I have one in the front yard and tower beside my house. There is a row of pines on the fence in the back yard with the power line for elect. coming in from the corner. Thus, the need for OCF dipoles and the shortened B&W. I really am thinking seriously about a vertical of some type. I don't want to have to put down radials but I guess that's almost a prerequisite for good performance. Ever notice no matter how many antennas you have it's never enough ?