Originally Posted by MattGuyver_007
That is not true.
Here is an excerpt from Firestik website: "...Do keep in mind that the NGP antenna system will not fix the problems that are due to poor installation locations. That is, if you've mounted a GP antenna in a manner that prevents it from radiating energy into free space (usually shows up as an unmanageable SWR problem), the NGP antenna will fail as well."
This would be the case when mounting on the rear bumper of a discovery, etc.
There is pretty much no-where on a ST 90 that you can mount a NGP antenna and cause issues (except maybe a short antenna on the rear bumper.)
The are talking about sheet metal/dense material blocking the radio-wave radiation...for example, mounting behind the cab of a semi...you would have a deadspot to the rear...