i had really poor performance after using WRL-14875 with 1w Sparkfun Lora breakout so i used my VNA to check SWR of these antennas, and they are all sky high and over 4.5 SWR in the 900Mhz band, although labelled 915mhz these are not.
I’ve used the VNA on some other 915 antennas that come with the little lilygo Oled Loras and they are 1.2 SWR, but these sparkfuns are not resonant and may cause some damage to the Lora. i bought 3 from Australian distributor and all 3 dont work, and sky high SWR. The seller told me to chase this up on the forum to get an answer. I dont have any way to contact SParkfun themselves, hopefully someone will see this post and come back with comments/solution
Posting a comment so we get an update as well - are keen to help Phil out if this is a product issue 
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