MAX4 Antenna Analyzer project by SP3SWJ, it is a great project, similar to IW3HEV VNA1, but developed by Jarek SP3SWJ to standalone device with LCD and it is battery operated.

you can use google translate to view this project links :

http://sp3swj.googlepages.com/

http://sp3swj.googlepages.com/max4

I built mine Vector Network Analyzer with a quality made PCB from Jarek SP3SWJ & SP8NTH.