I have the same problem. If you look at the drivers side rear window, at the top of the back pillar is a small rectangular rubber piece. It covers up the hole used for the old style antenna. So, you could get one from a 754 or a 945, a sedan won't work, and install the thing yourself. The factory radio might not have the control wire for the motor that contols the antenna, up/down if you know what I mean, so my may need a switch from the dash, the connector and wire.

My V70 has on glass antennas on both back glass pieces. The reception is pretty good except the high frequency response comes and goes, like the 965's radio too.
--
Warren Bain - '86 744Ti M46 >290Kmi, '99 V70Glt > 45K mi, '96 965 >100Kmi Wifemobile near Manassas Va.. Check the 700/900 FAQ via the 'features' pull down menu.