So sorry you have a Spypoint. I have one and its terrible. Transmits ok but the detection circuits in them are
very poor. Can't pick up game animals and lots of false pictures. Plus I just got a notice from Spypoint that 3G networks
will shutting down so if your trail camera is using 3G I believe the cameras may no longer work. Here is an antenna that may work that
costs very little to try. I got this from Tacta-Cam and it says for Trail cameras but with 4G. If you try it and it works then let us know.
I hope this helps.
https://www.amazon.com/Bingfu-Waterproof-T-Mobile-Cellular-Amplifier/dp/B07R9JGLV5/ref=sr_1_6?crid=3URK7FNT845YF&dchild=1&keywords=bingfu%2B4g%2Blte%2Bcellular%2Btrail%2Bcamera%2Bantenna&qid=1597691687&sprefix=bingfu%2B%2Caps%2C242&sr=8-6&th=1