I just did a portable PF installation on my LS-3A. This link is a great place to start. Download the PDF and read through it a few times. It was provided by the manufacturer and provides details and reasoning behind the antenna installation requirements.

https://www.google.com/url?sa=t&sour...WwW6tmqWu8cCmg

You will notice in the document, the standard dipole antenna is considered to have medium performance, and as you saw they can get in the way. I went ahead and bought the remote center fed dipole antennas (be sure to pay attention to the SMA polarity) and have found that my units sensitivity to other FLARM signals is very high, and I was able to place the antennas out of sight and in a spot that has an optimal view in all directions. The only standard dipole antenna on my unit now is the ADS-B/ Transponder antenna, and with nothing else around it I have a lot of flexibility to angle it safely away from the canopy. The key there is that the PF antennas are listening for a relatively weak signal where the ADS-B antenna is looking for a very strong signal.

I hope this helps!