Here's a failed patent on a system to auto-tune an antenna array meant for a KerberosSDR, but easily extendable to a KrackenSDR.

https://gitlab.com/crankylinuxuser/pantograph-antenna-array

All the details are here to do autotuning to the frequencies available to a KrackenSDR dependent on frequencies. This device and antenna go from 400MHz to 1.7GHz.