With the ArduSimple Magnetic Stand for SMA Antennas you will be able to place your Helical and LR antennas in a better location, not directly connected to the electronics board. This will help you incresae the signal reception and the reliability of your wireless connection.
Thanks to its low loss RG58 2 meters cable, the improvement on location will have much more impact on performance than the small loss introduced by the extra cable.