It was new antennas :). The antennas shipped with the Reach are a compromise of weight and gain. They are specifically built for UAVs iirc.
Since my application is land rover and I could care less if it weighed 100lbs, as long as it worked well, I opted to get a new antenna. After speaking with someone at Tallysman they recommended the TW3710. So far I’ve been very happy with them and was running RTK under some stormy skies at one point (Tractor installation advice welcome - #31 by mr337)
Not for sure where your from but they cost me ~$100 each from Digikey and I had to get a cable for it to work with the Reach. Other than that plug and play.