I compared two antenna, a spider and the FA antenna + plus filter a while ago, both being located in the attic.
The one thing I did not change during this time was the connection between antenna and usb stick, the spider was always connected via a 3m RG316 pigtail cable, the FA antenna directly to the Pro stick/filter.
At the time it seemed the spider performed comparable or even somewhat better, e.g. higher mes/s count. Now I use the pigtail with a Pro Stick plus and the FA antenna, and now this setup seems to perform better than the Pro stick did with the external filter and FA antenna, especially the message/s count seems higher.
In short, I assumed a direct connection is better, but could this type of pigtail actually help to pick up signals?