Yono,
Diamond has some tri-band whips that are rated with more gain than the stock Alinco antenna. There are the RH951S (BNC) and SRH951S (SMA) whips:
https://diamondantenna.net/rh951s.html
http://www.diamond-ant.co.jp/english/amateur/antenna/ante_3hand/ante_hand2.h...
Diamond also has a larger quad-band whip, adding 6m to the three bands of the DJ-G7T, the SRH999:
https://diamondantenna.net/srh999.html
If you want to use a DJ-G7T to work AO-92's L/V mode, there are some directional antennas - including some designs you can make. I wrote about them last year here on the AMSAT-BB list:
https://amsat.org/pipermail/amsat-bb/2018-October/069868.html
Good luck, and 73!
Patrick WD9EWK/VA7EWK http://www.wd9ewk.net/ Twitter: @WD9EWK or http://twitter.com/WD9EWK
On Monday, May 6, 2019, Yono Adisoemarta via AMSAT-BB amsat-bb@amsat.org wrote:
Dear all,
Is there a better rubber ducky replacement for the Alinco G7T? Preferably with higher gain for the 1.2 GHz.
73 de Yono - YD0NXX