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WOW, It looks like those channels are in different directions, and at a distance of about 60mi.
Depending on terrain, foliage (Trees) ect, a good directional antenna placed high enough should be able to receive distant stations. The antenna that you have I have installed many times (Roof or Chimney mounted) in metropolitan areas (Phila & New York) and have achieved good results, in looking at the specs it has a 10Db gain in the UHF band, this is good.
Afew things to think about, First you are loosing signal by installing this in an attic, is it possible to get it to the roof? This will help a lot.
Secondly, what type of cable are you using?
Third , I notice channels at different directions, you should be able to receive the 5 channels that are closest.
I looked at the french site that you posted, the antenna listed or shown there is obviously supposed to be mast mounted and the sets of panels are kind of hinged so you can set it up to receive from two different directions or position all the panels in the same direction for more Db gain. In any event I have also installed these and yes they do work well.
The other stations shown on the radar plot are pretty far away.
Be also aware that UHF does not travel as far as VHF signals, so it may be possible to watch a channel broadcast on VHF and have a UHF channel broadcasting from the same location that you can't receive.
Bottom line is, if you are receiving the stations but they are weak (Inside the attic), try to get the antenna to the roof and look at the results, if the signals are still weak I would try a stacked panel antenna like I discussed earlier in the post.
Hope this info will give you some guidance.
Kind Regards!!
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