<s>
Shortwave	B-Algorithm
bands	I-Algorithm
are	O
frequency	O
allocations	O
for	O
use	O
within	O
the	O
shortwave	O
radio	O
spectrum	O
(	O
the	O
upper	O
medium	B-Algorithm
frequency	I-Algorithm
 [ MF ] 	O
band	O
and	O
all	O
of	O
the	O
high	B-Algorithm
frequency	I-Algorithm
 [ HF ] 	O
band	O
)	O
.	O
</s>
<s>
Most	O
international	O
broadcasters	O
use	O
amplitude	B-Device
modulation	I-Device
with	O
5kHz	O
steps	O
between	O
channels	O
;	O
a	O
few	O
use	O
single	B-Device
sideband	I-Device
or	O
reduced	O
carrier	O
single	B-Device
sideband	I-Device
modulation	I-Device
.	O
</s>
<s>
Although	O
this	O
is	O
regarded	O
as	O
shortwave	O
,	O
it	O
is	O
a	O
MF	B-Algorithm
band	O
.	O
</s>
<s>
Citizens	B-Application
band	I-Application
(	O
CB	O
)	O
allocation	O
in	O
most	O
countries	O
,	O
is	O
slightly	O
higher	O
in	O
frequency	O
than	O
the	O
broadcasting	O
11m	O
band	O
.	O
</s>
<s>
There	O
are	O
reports	O
of	O
pirate	O
CB	B-Application
radio	I-Application
users	O
operating	O
equipment	O
on	O
frequencies	O
as	O
low	O
as	O
25.615	O
MHz	O
.	O
</s>
<s>
WTWW	O
(	O
whose	O
main	O
programming	O
is	O
on	O
5.085	O
)	O
,	O
WBCQ	O
(	O
5.130	O
)	O
and	O
WRMI	O
(	O
9.335	O
,	O
7.73	O
,	O
7.78	O
)	O
all	O
operate	O
at	O
least	O
some	O
of	O
their	O
frequencies	O
outside	O
the	O
designated	O
shortwave	B-Algorithm
bands	I-Algorithm
.	O
</s>
<s>
Amateur	O
radio	O
operators	O
in	O
many	O
countries	O
are	O
allocated	O
several	O
shortwave	B-Algorithm
bands	I-Algorithm
for	O
private	O
,	O
non-commercial	O
use	O
.	O
</s>
<s>
Shortwave	O
(	O
HF	B-Algorithm
radio	I-Algorithm
)	O
is	O
used	O
by	O
transoceanic	O
aircraft	O
for	O
communications	O
with	O
air-traffic	O
control	O
centers	O
out	O
of	O
VHF	B-Algorithm
radio	O
range	O
.	O
</s>
<s>
Due	O
to	O
antenna-length	O
requirements	O
and	O
the	O
band	O
's	O
long-distance	O
propagation	O
characteristics	O
(	O
undesirable	O
in	O
these	O
cases	O
)	O
,	O
much	O
land-mobile	O
radio	O
activity	O
has	O
moved	O
to	O
VHF	B-Algorithm
or	O
UHF	O
and	O
most	O
cordless-phone	O
use	O
is	O
at	O
UHF	O
or	O
higher	O
.	O
</s>
<s>
CB	B-Algorithm
radio	I-Algorithm
in	I-Algorithm
the	I-Algorithm
UK	I-Algorithm
can	O
be	O
heard	O
from	O
27.60125	O
to	O
27.99125MHz	O
in	O
10kHz	O
steps	O
as	O
well	O
as	O
the	O
lower	O
26.965	O
to	O
27.405MHz	O
allocation	O
.	O
</s>
<s>
Since	O
the	O
end	O
of	O
the	O
Cold	B-Application
War	I-Application
specific	O
military	O
HF	O
allocations	O
have	O
gradually	O
disappeared	O
from	O
the	O
HF	O
bands	O
,	O
except	O
for	O
Africa	O
and	O
some	O
parts	O
of	O
Asia	O
.	O
</s>
<s>
The	O
industrial	O
use	O
of	O
the	O
frequency	O
suggested	O
the	O
use	O
of	O
the	O
11m	O
band	O
for	O
CB	B-Application
radio	I-Application
.	O
</s>
