SureCall antennas will help boost your signal no matter the conditions:

Yagi antennas work best for broadcasting signal directionally for faraway cell towers.
Omni antennas work best for locations where you need to broadcast signal coming from different directions simultaneously. Panel indoor antennas work best for wall installations and directional signal broadcasting. Dome indoor antennas work best for ceiling mount installations in open areas. Ultra-thin indoor antennas give you more dB gain than the other indoor antennas.