>>Is there a significance about internal (hidden) versus external
>>(protruding/retractable) antenna in terms of signal reception?
[quoted text clipped - 6 lines]
>perhaps it's just a poorly enginnering job that makes Ericsson
>handsets have worse RF than others.
It's actually urban myth/legend -- model differences notwithstanding, Sony
Ericsson handsets are as good in general as any other manufacturer (and better
than most IMHO). For example, I know of no tri-band Nokia that does a better
job on RF with internal antenna than the Sony Ericsson Z600. And I've yet to
see any handset with an internal antenna that measures up to the Sony Ericsson
T39m with (extendable) Extended Range antenna.
Of course, as always, YMMV. ;)

Signature
Best regards, HELP FOR CINGULAR GSM & SONY ERICSSON PHONES:
John Navas <http://navasgrp.home.att.net/#Cingular>