The Yaesu FT-897D has two antenna ports: "HF/50 MHz" and "144/430 MHz". The manual states:
The "HF/50 MHz ANT" jack is used for HF and 50 MHz, while the "144/430 MHz ANT" jack is used for 144 MHz and 430 MHz.
I haven't been able to find anything in the manual about what happens between 54 MHz and 144 MHz. For example, say I have a 100 MHz upconverter. Should I be using the "144/430" or the "HF/50" antenna input to receive WWV at 110 MHz?
At which frequency should I switch from the HF antenna port to the VHF/UHF port?