It's disappointing that that page doesn't seem to particularly disapprove of the utterly hopeless one that's just two resistors compared with the last fully screened inductive one which is probably quite reasonable.
It's also worth pointing out that if the signal is pretty weak you might be better off with a combined signal booster and splitter.
The point is unless you take the last two examples to destruction you will not know if they are inductive or resistive. The plastic case is usually moulded on and untill removed/destroyed it's practically impossible by inspection to tell if there is a full metal screen beneath.
It's possible that even the first example from a different manufacturer may be inferior, but unlikely.
It's much like using unscreened or fully screened wallplates
Note: Satcure no longer trade.Code:http://www.satcure.co.uk/tech/wallplates.htm
Avoid any potential problems with local electrical interference and go for the fully screened products in the first place.
Xtrend ET10K, 2 x satellite tuners 28.2 (Sky FTA), 2 x hybrid (UK Freeview), Zgemma H9S (satellite)
You might be able to make a good guess at them being hopeless using an ohm meter.
If any combination isn't either near zero ohms or near completely open be suspicious.
(Near zero probably being less than 1 or maybe 2 ohms and near open being greater than say 10k ohm)
Xtrend ET10K, 2 x satellite tuners 28.2 (Sky FTA), 2 x hybrid (UK Freeview), Zgemma H9S (satellite)