Simple answer is no.
Tri-booms such as the one in your link are a bit of a blunt instrument crossed with a vanity project for people who feel the need to show off that they bought the biggest-looking aerial in Christendom
Your current aerial is not as high-gain as it claims, and it's not 32 element either. They counted each element 4 times. This is common sharp practise for the industry because it's easier to make big-looking numbers than explain how aerials really work. It's just human nature. The 'high-gain' bit only really applies to the upper-end of the frequency range; roughly frequency channels 50 to 68. The thing is that we don't use channels 60-68, and channels in the 50 to 59 range are getting cleared too due to 5G mobile phones.
What all this means is that aerials such as the Tri-booms and your existing one will no longer be a good match for transmitters that used the upper end of the old ch 21-68 range. The new transmission frequencies will be lower down the range where these aerials don't perform that well.
The TV is measuring on the optimistic side. Your signal is just over the acceptable level, which for digital is fine, but it leaves very little margin for any level change. In your case the rain on the slates/tiles is knocking off about 5dB and that's enough to cause disruption.
Short term solutions:
Fit a loft amp / masthead amp. As long as your quality reading is high (80+%) then you'll squeak by with this.
Move and align the aerial for better reception in the loft.
Longer-term solution:
Change to a Log Periodic aerial fitted with a variable-level masthead amp.
Ultimately, due to the Freeview retunes as a consequence of selling-off the channel space for 4G and 5G all the frequencies are going to move away from where a high-gain wide band aerial works best. Log Periodics are a good solution where the channels will be spread across what remains of the channel spectrum. That looks to be the case with Pontop Pike.
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