Try a UHF Yagi (42XG, 43Xg or 91X) aimed directly at Springfield and see if you can receive KBRK or at KWBM. Be prepared to try multiple locations and/or heights for the antenna. If sucessful, have the folks at
www.tinlee.com make you a custom combiner for channel 49 (for KRBK) or channel 31 (for KWBM). Ask for a model AC-7 for the needed channel.
I would use the pre-amp only on the UHF Yagi, the signals from the C2V should not need a pre-amplifier. Install the AC7 so as to combine the amplified KRBK/KWBM signal with the non-amplifed signals from the C2V, then distribute the signals.
That Skywalker amp is a terrible excuse for an amp as it is very noisy. If you actually need a single-output distribution amplifier (you may not), then a CM-3410 or the PCT equivalent works well.