you can buy the one that the CEO uses https://www.amazon.com/gp/product/B074YWTCB1/ref=ox_sc_saved_title_7?smid=A3VP7QY3689O35&psc=1 you'll also need the cable and female to male
10 dBi Proxicast, but it's sold out now. :/ Everything selling out quick.
https://www.amazon.com/Proxicast-Omni-Directional-Outdoor-Fiberglass-Antenna/dp/B074YWTCB1
I'm in Los Angeles also. I recently upgraded to this one:
https://www.amazon.com/gp/product/B074YWTCB1/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1
I haven't seen a big jump in performance yet but I've only had it a couple of weeks.
i'm using proxi antenna 10dbI https://www.amazon.com/gp/product/B074YWTCB1/ref=ppx_yo_dt_b_asin_title_o05_s00?ie=UTF8&psc=1
but they say that if you go with 915 mhz antenna is better. But i already invest in this one so i will have to use this one for awhile till next change. hmm. There are hotspot near me within 5 mile range but it never interact with them i don't think? all my witnesses has been coming from dam chicago area lol which like it says 25 miles away is 40.23km
Not the specific one we used but literally anything with a standard antenna end will work. Something like this: s://www.amazon.com/Proxicast-Omni-Directional-Outdoor-Fiberglass-Antenna/dp/B074YWTCB1
Proxicast 10 dBi 3G / 4G / LTE High Gain Omni-Directional Fixed Mount Outdoor Fiberglass Antenna for Verizon, AT&T, Sprint https://www.amazon.com/dp/B074YWTCB1/ref=cm_sw_r_cp_api_i_TVSuFbBNZ85NN Eightwood RP-SMA Male to N Male... https://www.amazon.com/dp/B0841J2652?ref=ppx_pop_mob_ap_share