I am trying to set up an ultra-portable FM satellite station-something that can be used pedestrian mobile, and something that will fit into a school size backpack for airline travel.  Have the HT already-a 10 watt TIDRADIO HT and have made a couple of satellite QSOs using its stock rubber duck.  

I bought a Nagoya 771R telescoping version of their 771 antenna (which everyone raves about) but it doesn't hear the Mode J satellites well.  The stock rubber duck hears them better.  The antenna is supposed to be a 5/8 wave on 70cm, maybe that is the problem.

Any recommendation on HT antennas people have been using on the satellites with success?  It needs to be a whip type antenna-not a yagi that breaks down for transportation.  I realize this is a very limited setup, but it is better than being QRT in some circumstances.

73 John AF5CC