The Antennas Direct C5 should improve the reception of CFPL 10, but it doesn't have enough gain for CKCO 13.
If your 7777 is the original version with separate UHF and VHF inputs, connect the VHF antenna to the VHF input, with the switch set to separate. If your 7777 has only one input, you will need to combine the UHF antenna and the VHF antenna with a UVSJ UHF/VHF combiner (AKA diplexer) before the preamp.
http://www.solidsignal.com/pview.asp?p=uvsj
https://mjsales.net/products/tru-spe...ant=1198505857
with weatherproof housing:
https://www.antennasdirect.com/store..._combiner.html
do not buy the MCM 33-2230 combiner unless you are willing to take a gamble on quality control problems:
http://www.mcmelectronics.com/produc...-2230-/33-2230
The MCM 30-2475 can be used for 10 or 13:
http://www.mcmelectronics.com/produc...-2475-/30-2475
but the 30-2476 has a little more gain for 13:
http://www.mcmelectronics.com/produc...-2476-/30-2476