Dear All,

I have difficulty at choosing the optimal quasi-omni-directional antenna 
[compact & cheap, but good-performance at urban area: 3-5 km @ +20dBm, 
lowest data rate, LoRa, -148dBm rec. sensitivity] for RFM95 868 MHz 
transceiver module.

What do you think about these two PCB trace antennas?
http://www.ti.com/lit/an/swra227e/swra227e.pdf
http://www.ti.com/lit/an/swra416/swra416.pdf

As far as I have read & understand, (although the helical one needs 
accurate matching) they both have better gain parameters than these 
comparatively more expensive solutions:

https://www.linxtechnologies.com/resources/data-guides/ant-868-jjb-xx.pdf
http://www.mouser.com/catalog/specsheets/ANT-868-uSP-datasheet%20121228.pdf

Another option, I may use simple wire. (What kind of wire should use?) 
But I have to bend it twice to make it fit to a 4x4cm case. Does it 
degrade the performance heavily?

Thank you very much for sharing your knowledge & experience.
Best regards...