The ridge lines on each side are 450' higher than my house and about a half mile apart, maybe less
So let's assume that the peaks are 450' above your house and 1200' away. (That assumes that
the 1/2 mile figure is to the peaks of the ridge rather than the base.) Applying a bit of math, that
makes the angle from your house to the top of the peaks about 20 degrees. That's really not so
bad, though not optimum for DX signals. Twenty degrees should get you out to 1000 miles or so
pretty reliably, and sometimes beyond that due to multi-hop or other interesting modes.
I'm going to guess that you'll find better results on 20m and 40m during the day, and likely 80m at
night (or perhaps 160m if you have room for an antenna.) 40m is one of my favorite bands, and a
simple dipole should give you plenty of contacts.
And that is going East / West, where the hills are closest. In other directions you'll have a
lower angle of radiation and be able to work longer distances.