Source RPM issue

Hi,
I have created one soruce rpm by using some help file on net. when i installed the rpm with command "rpm -i xxx.rpm", by default it got installed under "/usr/src/redhat/SOURCES/. I want to install these source file under /application/myapps/.
Also i want some guidence to improve the source RPM.
SPEC file :
#
Summary: A app that rocks!
Name: ew_client
Version: 1.0
Release: 303
Copyright: Symantec
Group: Applications/Internet
Source: ftp://xx.com/pub/goeveryware/ew_client.tar.gz
URL: http://www.xx.com/goeveryware/index.html
Distribution: RHCE Distribution
Vendor: Copr.
Packager: Rajesh Kumar <rajeshkumar.raj06@gmail.com>
%description
This RPM
%prep
rm -rf $RPM_BUILD_DIR/myapps
zcat $RPM_SOURCE_DIR/ew_client.tar.gz | tar -xvf -
%build

%install

%files
/usr/src/redhat/BUILD

Need help in urgent...

Raj