I was planning to install a Huawei e8372h LTE modem in the car. Knowing it would be hidden under the dash I bought these to fit in the A-pillars to improve the signal. Testing the e8372h indoors, in the garage, on the street, and in the car, with and without the antennas attached, the Signal and Speedtest.net results were better WITHOUT. In fact, in all scenarios with the antennas attached, the modem failed to connect at all and frequently disconnected. Without an antenna, the device also gets a pretty good signal and transmission speed in the dashboard behind the head unit. So it's not just a waste. They can even make you feel worse.
Boost Mobile Signal with 4G LTE Antenna TS9 - Dual πΆ Mimo WiFi Amplifier for Huawei Hotspot - Long Range High Gain Antenna
9 Review
Gadgets World FBA_ALFA ARSN19M OMNI Directional High Gain
9 Review
πΆ Hawking HAI6SIP: Boost Your Wireless Signal Range with Hi-Gain 6dB Omni-Directional Antenna
9 Review
π‘ MikroTik LHG 5: High-Gain Dual Polarization Grid Antenna, Enhanced 5 GHz Performance (US Version)
9 Review
π StarTech.com NETRS232 Serial to IP Ethernet Device Server - DIN Rail Mountable - Serial Device Server - Serial Over IP Device Server (Black)
4 Review
π StarTech.com NETRS2321P: 1-Port RS232 to Ethernet IP Converter, Serial over IP Device Server - Black
5 Review
π Juiced Systems Silver BizHUB USB-C Multiport Gigabit HDMI Hub with 3 USB 3.0 Ports, Gigabit Ethernet, 4K HDMI, SD/Micro SD, and USB-C Power Delivery
11 Review
π USR-TCP232-410s: RS232/RS485 Serial to Ethernet Adapter/IP Device Server with DHCP/DNS Support
4 Review