Hi Jed,
What do you mean by - it won't perform well?
Currently, when I use just the antenna (2.3-2.7GHz), with no filters, and connect to it a GSM mobile phone, then the mobile phone manages to communicate with the network on the 1800MHz band.
However, there might be things / problems which I didn't notice yet (for example, i did not check the quality of the voice call audio).
Therefore, could you expalin 'not perform well'?
Do you mean just reception strength, or something else?
Thanks a lot