It's a tough call, Phil.
Has it been an ongoing issue with reliable reception?
What's the terrain like between your antenna and Gan Gan Hill?
Why the last change of antenna?
Are you able to post up some signal measurements of each channel?
If you have crappy signal quality at the antenna, adding an amp usually doesn't help.... so knowing what signal strength & quality you are currently getting will help provide an 'educated guess'.
How many TV outlets in the house (including any unused at present)?
The amp in your link is wideband... including VHF Bands 1 & 3 + FM.
The translators on Gan Gan Hill are only 600 watts (vertically polarised) all UHF band 4, so if you do need a MH amp, a UHF-Only model (with LTE filtering) would be best.
I can help with more info if you can provide answers to the questions above.
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