Is this considered lmr 400 cable coupler? that's what my internet service provider told me that i'd need to connect 2 25'-pieces together for antenna

You need LMR 400 bullet aka coupler. I bought N-type coupler - they look similar but LMR400 had much larger diameter center pin ...google lmr400 and look at images ...

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⚡ Connect like a pro — signal perfection, no compromises!

SEAMLESS SIGNAL FLOW - Experience near-zero attenuation with just 0.1dB loss, keeping your connections crystal clear.
PLUG PLAY SIMPLICITY - Effortlessly connect N-type male coax cables with a secure, perfect fit every time.
RUGGED ALL METAL BUILD - Heavy-duty, weatherproof design ensures reliable outdoor performance without compromise.
ULTRA WIDE FREQUENCY RANGE - Supports up to 6000MHz, perfect for cutting-edge RF and telecom setups.
VERSATILE PRO GRADE COMPATIBILITY - Ideal for antennas, ham radios, Wi-Fi, cell boosters, and advanced digital communication systems.

The XRDS-RF 2PCS N Female to N Female Coax Cable Adapter is a precision-engineered, low-loss RF connector designed for professional-grade coaxial cable setups. With ultra-low 0.1dB signal attenuation and a frequency range up to 6000MHz, it ensures optimal signal integrity. Its rugged all-metal, weatherproof construction guarantees durability for both indoor and outdoor use, making it ideal for antennas, ham radios, telecom, and advanced digital communication systems.

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