I don't need a new preamp. But what ya should be asking for is what is the iip3? eg - the maximum of two or more strong input signals without causing intermod distortion at the output. Absent Specs from the mfr, maybe you can do some testing of your own in strong signal areas to get an idea.Separate amps for UHF and VHF.
The KT-700 has a peak gain of 23 dB UHF but is does vary from 21.84 dB at 600mhz and 22.75 dB at 475 mHz
VHF, KT-700 is 25 dB peak gain.
".95 dB on VHF and 1.35 dB on UHF but we still might make some improvements on that."
Any extra filtering like LTE will add to the noise figure. FM trap included