?? Perfect DIY Product ?: the Vector Network Analyzer provides perfect vector network measurement capabilities, tiny and handheld, stand-alone with 2.8-inch LCD display, portable with battery powered or USB powered(battery Not included ) ?? Improved Frequency Algorithm ?: the Antenna Analyzer can use the odd harmonic extension of the si5351 to support measurement frequencies up to 900MHz. The TX / RX method measures the complete S11 and S21 parameters. If you need to get S12 and S22, you need to manually replace the transceiver port wiring. ??Metal Shield Designed?: the HF VHF UHF UV VNA Antenna Analyzer with metal shield design which reduce the external interference and improve the measurement accuracy. ?? Better 600M-900M Band ?: The si5351 direct output in the 50k-300MHz frequency range provides better than 70dB of dynamics, the extended 300M-600MHz band provides better than 60dB of dynamics, and the 600M-900M band is better than 50dB of dynamics. ??Small and Portable, Easy to Use?: Unit is designed to Original Equipment (OE) fit, form and function Simple and practical PC control software, we can export Touchstone (snp) files for various radio design and simulation software through PC software.