There is an easy way to work linear birds from mobile. All you need is a single band SSB mobile radio (FT-857, FT-897, etc), a portable SSB receiver (TH-F6, etc.) and very simple antennas for the downlink (like the CJU for mode J, 1/4 whip for mode B, etc):
http://eb4dka.laserenadigital.com/Amateur%20Satellite%20Articles/FO29_MOBILE...
http://eb4dka.laserenadigital.com/Videos%20AMSAT/VIDEO_EB4DKA%20via%20FO29%2...
I´ve made hundred of QSOs via FO-29 using this little station. It also works nice on FM birds.
Best 73s
Pedro EB4DKA http://eb4dka.laserenadigital.com
Show me an all-mode HT that retails for the same sort of price and is the same sort of size as an FM HT and I might be interested. Otherwise, to get UHF and VHF SSB I'm stuck with an inconveniently large radio which is only really useful for the twenty minutes a day that a satellite is overhead.
Not to mention the difficulty involved in tuning the radio and aiming the antenna. Doesn't the Doppler shift mean you need to constantly retune? How do you manage to do that, key the mike and point the aerial, *and* have enough brainpower left to make a contact?
Gordon MM0YEQ