Got them, thanks. See your PM reply.
Please tell us about your preamp and distribution amp and describe the basic cabling scheme. One amp is usually sufficient, two amps are too often too many. There are situations when using both might be appropriate, but that configuration is best handled with a signal analysis first to prevent inadvertent over-amplification.
That chimney is dead in the signal path to Boston. If you swap from a C4 to a DB4e (for example), the extra height of the DB4e will mean that half of it will be below the chimney, rendering half of the antenna ineffective. The shorter (vertically) C4 *might* be the better choice, depending on what improvement you're targeting or seeking. My best technical advice for reliable reception would have to be "don't put the antenna behind the chimney".
Trees are probably going to be your biggest issue once they leave back out. Probably unavoidable. You'll likely find that several stations seem to be immune from issues while the rest may be affected in varying degrees depending on the foliage density, whether they're wet or not, and how the wind is blowing at the time. I often refer to the trees acting like a Cuisinart and the resulting signals are like Humpty Dumpty after his fall. You get the allusion, I'm sure.
