I guess I would go to the source. https://www.helium.com Beware. You won't get your money back on an antenna system for about 10 years. They have the mobile version (5G) which is interesting. https://hellohelium.com/hotspot/indoor I thought about testing the phone plan since it's only $20/month and runs on the Tmobile network as well as their hotspots. Anyways, this is getting off track.