There are a couple of possible outcomes. Having the dish behind the OTA antenna could help block any interference that might be coming from that direction. On the other hand, having the dish reflecting the OTA signals could cause multi-path interference.
Well, here's what I did, I used a hacksaw to cut off the "eyes" of an EA lnbf, drilled trough the back plate and used a U-Clamp to attach a cut-off piece of a pole for pole mounts.
I tried it pointing at and away from the reflector. At picked up 2 channels and away picked up six, then I remembered something. I had to remove the Solo Hub, which I forgot about away picked up 17 channels. I didn't try pointing to towards the reflector again.
Pointing it south at Springfield, I only picked up my normal Peoria Channels. Sadly...
Pointing it North East like my other one is for Peoria, I got 100% Signal strength on every channel! That's a one big bonus. Fox was particularly weak before. Both antennas are the same, just the other one isn't on a Dish Reflector.
Bottom line is, the Reflector did not enhance range enough to pick up towers that are 50+ miles away but it did help tremendously with local towers. BTW, this is on top of my garage, so about 15' off the ground