4in1 Filter - Four-in-one passive LC filter for RF signals. This single unit consolidates four band filters into one device, simplifying installation and reducing the need for multiple components. Passive Filter - No external power required. The filter operates passively, lowering power consumption, heat, and wiring complexity while increasing likelihood of reliable operation in remote or space-constrained setups. 4band LC Filter for RF Signal - Designed to handle RF signals across four bands with a single LC network. Provides targeted attenuation of unwanted frequencies to improve signal cleanliness and integrity. Ideal for Radio Antenna, SDR, GPSDO Signal Source - Compatible with radio antennas, software-defined radios (SDR), and GPSDO signal sources. Enhances signal quality and stability by reducing unwanted RF content in common applications. Easy to Use - Simple to incorporate into your existing setup. No power, no tuning, and no complex configuration required. Use scenarios - Use with a multi-band radio antenna to reduce out-of-band interference and improve overall reception quality. - Use in front of an SDR to clean the RF spectrum across four bands, helping to improve signal-to-noise ratio. - Use on a GPSDO signal path to suppress RF noise and support more stable timing signals.