I've been experimenting with building homemade Yagi antennas to improve Verizon 4G reception. They've all worked surprisingly well. For anyone interested, I've documented the build process with many pictures and some brief testing results. The write-up is available here:
»bcbj.org/antennae/lte_yagi_diy.h ··· _diy.htm
It's a fun afternoon project--it takes about four hours to build. I selected parts to keep the total cost of the antenna itself around $10. For those on a budget, this is one way of increasing your data reception at a minimal cost.
I tested the antenna in my attic with the VL600 and UML290. It increases the RSSI by around 10-15 dB, and increases the SINR by about 8-10 dB. YMMV.
Some photos are included below. I'd be happy to answer any questions or provide more info.
No antenna (UML290):
DIY Yagi (UML290):