In two words, I can: "severe overload." Sorry to be the bearer of bad news, but in attempting to solve a problem, you made it worse. Don't feel too bad -- you aren't the first to make this mistake, and I've got a tiny little hunch you won't be the last, either.
The MANT940 is a very small antenna that relies on a built-in amplifier. It does an OK job receiving UHF broadcasts simply because smaller antennas are better suited to stations at those frequencies. The 940 frequently stumbles on VHF broadcasts, though, due to the longer wavelength involved.
Adding a second amplifier is almost always a big mistake. Digital tuners overload much more quickly than analog tuners did. Overload isn't harmful to the electronics -- remove the source and it goes away -- but it frequently causes loss of at least one, and sometimes all, stations. When you added the second amp, either it or the tuner overloaded on every station.
The solution is a better antenna, not another amp, and we can advise you on which one might be a good choice if you would provide a ZIP code so that we can look up signal conditions in your general area. But be warned: By "a better antenna," it's going to mean something substantially larger than a MANT940!
(Ed. note: The guy at RS should have known about this issue and recommended a new antenna, not an amp. Shame on them! Return the amp for a refund. We'll recommend the good stuff you can only buy online.
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