For VHF/UHF a "base station" is nothing more than a mobile unit plus a power supply. Just turn the mounting
bracket upside down, put some felt or plastic stick-on feet on it.
Two things differentiate the performance of a base station vs. handheld (HT, for "handie talkie")... (1) power and
more importantly, (2) antenna (and antenna height).
Even at the same power, the higher, better antenna of the base station will give much better performance.
Connecting a handheld to your rooftop (or tower) antenna will give excellent range. At VHF/UHF frequencies
it is all about antenna height, and how far it can "see" the other antenna.
If 10 watts gets you to the horizon, even 100 watts will not get you very much further, if at all. Choosing a
60 watt radio over a 50 watt radio based on power alone is foolish. Prime example, the Yaesu FT-1900R (55 watts)
and FT-2900R (75 watts). They have exactly the same operating features, same button arrangement, all the
same. But the 2900 is larger, heats up more when transmitting, and in the real world transmits no farther than
the tiny 1900.
It's all about antenna.