I took a look for the Televes Avant X and in my wanderings found it to be unavailable on amazon. They did however display these...
Televes 560483 combiner preamp...$100
Channel Master CM-0500 JOINtenna TV Antenna Combiner $20
Im sure the downside of these is similar to what you have posted regarding interference due to possible out of phase signals/and no adjustments to the filtering.
Do these work better than reversing through a splitter?
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